JPH11112962A - Digital broadcast receiver - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a digital broadcast receiving apparatus which can reproduce even if all broadcast data of one program is not received and has a small buffer capacity. SOLUTION: A receiving unit 201 for receiving and storing one block of broadcast data, and a video generating unit 204 for forming a display image of one screen from blocks output from the receiving unit 201.
And a viewer input unit 209 for receiving a viewer operation;
The change data corresponding to the viewer operation is stored in the unit storage unit 20.
5 and an operation condition determining unit 208 for controlling the video generation unit 204 to change the display image according to the searched change data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiving apparatus for receiving and reproducing an interactive animation video program that changes an animation operation in accordance with a viewer's operation.

[0002]

2. Description of the Related Art In recent years, with the development of digital broadcasting technology, a receiving / reproducing apparatus for receiving interactive animation video programs as broadcast data has been developed. For example, Japanese Patent Application Laid-Open No. Hei 8-2930
For example, Japanese Patent Application Laid-Open No. 8-249496 has filed an application for a "program processing method and an animation display device using the same".

[0003] The animation video programs described therein are composed of a plurality of objects.
The viewer can interactively generate an event for each object. And the device for receiving and playing this animation video program is
The received program including data such as video, audio and text is collectively stored in a memory in the apparatus and reproduced through a display screen and a speaker. When a viewer generates an event via a screen with a remote controller or a mouse while watching the video, the receiving device interprets the event and performs processing based on event processing data in the program.

[0004]

However, the prior art digital broadcast receiving apparatus has a problem that a large-capacity memory is required to store broadcast data. Further, since the reproduction of the program cannot be performed until all the broadcast data for one program has been received, it takes a long time to start the reproduction.

[0005] In view of the above problems, it is an object of the present invention to provide a digital broadcast receiving apparatus that can reproduce even one program without receiving all the broadcast data, and has a small buffer capacity.

[0006]

A receiving apparatus for receiving broadcast data broadcast in units of blocks, wherein each of the blocks includes a plurality of pieces of graphics information representing image elements to be displayed on a screen. The graphics information includes position data indicating the initial arrangement position of the image elements on the screen, graphics data indicating the shape of the initial image elements, and processing data. The processing data includes operation data indicating a viewer operation and the graphics data. The receiving device, receiving means for receiving broadcast data, storage means for storing one block of received broadcast data, and position data extracted from the storage means. Display image forming means for forming a display image of one screen from graphics data, accepting means for accepting viewer operation, Search means for searching for change data corresponding to the viewer operation received by the reception means from the processing information of the storage means; and control means for controlling the display image forming means to change the display image according to the searched change data. And

[0007] The graphics information includes a plurality of position data, the plurality of position data indicate arrangement positions of image elements different from each other, and are transmitted according to a timing at which the arrangement positions of the image elements are to be changed. The control means
When the position data is received and stored in the storage unit, the display image forming unit may change the arrangement position of the image element.

[0008] The digital broadcasting apparatus further comprises: a judging means for judging whether or not the display image forming means has completed the formation of the display image of the current block when the new block is received by the receiving means. If it is determined that the new block, the new block is stored in the storage means,
If it is determined that the processing has not been completed, a continuation unit may be provided that causes the receiving unit to discard the new block and continue forming the display image of the current block by the display image forming unit.

[0009] The display image forming means has a first mode for drawing without deteriorating the precision of the graphics data, and a second mode for drawing with deteriorating the precision of the graphics data. Alternatively, a mode designating unit for designating the first mode or the second mode to the display image forming unit may be provided. The position data is
Further, the display image forming means includes layer information indicating a drawing layer of graphics data, wherein the display image forming means individually stores an image formed from the graphics data of each piece of graphics information, And a forming unit for forming a display image from the image data. The receiving unit receives a request to change layer information of any graphic data from a viewer, and the control unit receives the layer information change received from the receiving unit. May be configured to change the display image of the forming unit according to the instruction.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows a format of broadcast data received by a digital broadcast receiving apparatus according to a first embodiment. The broadcast data shown in the figure is composed of blocks 100, 101,... Corresponding to approximately two to three minutes of a broadcast program, and is transmitted in the order of broadcast time for each block.

The block 100 comprises a block start flag 102 indicating the start of the block and graphics information 103 to 105 indicating information on image elements to be displayed on the screen during the broadcast time. . The graphics information 103, 104, and 105 represent image elements A, B, and C representing an object, respectively. The same applies to the blocks 101,. However, the number of graphics information may be different for each block.

The graphics information 103 includes an image element A
, A positional information 103b, an operating condition 103a, and a unit 103d. The geometric shape 103c is graphics data representing the initial shape, color, and the like of the image element A. The data representing the shape is
Examples include polygon data and bitmap data.

The position information 103b is coordinates indicating an initial arrangement position of the image element on the screen. Operating condition 103a
Is information that defines what operation the digital broadcast receiving apparatus should perform on condition of viewer operation. Specifically, it is composed of a plurality of viewer operations and corresponding action descriptions (scripts). The operation description is, for example, a script for performing movement, deformation, discoloration, and the like of the image element A using the unit 103d.

The unit 103d moves the image element A,
This is the replacement of graphics data for the image element A for performing deformation, discoloration, and the like, sound effects, audio data for playing BGM, and the like. Graphics information 104,
The same applies to 105. FIG. 2 shows an operation condition 103a of the image element A and an operation condition 104 of the image element B in FIG.
a, an example of the operating condition 105a of the image element C is shown in a table format. In each table, the left item indicates a viewer operation for each image element, and the right item indicates an operation description (script) of the receiving device to be performed for the viewer operation.

For example, in response to a viewer's operation of “pressing the left arrow key”, the operation description includes “unit 10
The position coordinates are changed from coordinates X to Y while alternately displaying images using the two units 1 and 2 of 3d. " Next, a receiving apparatus for receiving broadcast data composed of blocks in the above format will be described.

FIG. 3 is a block diagram showing the configuration of the digital broadcast receiving apparatus according to the present embodiment. In the figure, the digital broadcast receiving apparatus includes a receiving unit 201, a data separating unit 202, a position information storage unit 203, a video generation unit 204, a unit storage unit 205, an operation condition storage unit 206, and a display unit 2.
07, an operation condition determination unit 208, and a viewer input unit 209, and receives broadcast data in the format shown in FIG. 1 and reproduces it for each block.

The receiving section 201 receives a block to be transmitted and stores it in an internal buffer (not shown). When all the blocks have been received and stored, the receiving unit 201 outputs them to the data separating unit 202, and receives and stores the next block. The data separation unit 202 separates each piece of information in the block and outputs it to each storage unit. That is, when a block is input from the receiving unit 201, the data separating unit 202 separates the graphics information included in the block into operating conditions, position information, geometric shapes, and units. The operation conditions are stored in the operation condition storage unit 206, the position information is stored in the position information storage unit 203, and the geometric shape is stored in the image generation unit 2.
At 04, the unit is output to the unit storage unit 205.

The position information storage unit 203 includes a data separation unit 2
02 holds the position information of each piece of graphic information that is input. The unit storage unit 205 includes the data separation unit 202
Holds a unit of each piece of graphics information input. The operation condition storage unit 206 holds the operation condition of each piece of graphics information input from the data separation unit 202.

The image generation unit 204 includes a data separation unit 202
Based on the input geometric shape, graphics of an initial image element are formed, and the graphics are arranged at the position indicated by the position information in the position information storage unit 203 to generate an initial image and output it to the display unit 207. . Other functions of the video generation unit 204 will be described later. The display unit 207 displays the CR
An image generated by the video generation unit 204 is displayed on a T or a liquid crystal display.

The operating condition determining unit 208 includes a viewer input unit 2
When the viewer operation is received from 09, the operation condition storage unit 2
With reference to 06, an operation description corresponding to the viewer operation is searched. As a result of the search, if there is a corresponding operation description, the unit specified in the operation description is stored in the unit storage unit 20.
5 and notifies the video generation unit 204 to change the display image using the unit.

The viewer input unit 209 includes a remote controller or the like, and receives a viewer's operation on an image element on the screen and notifies the operation condition determination unit 208 of the operation. Video generation unit 204
Changes the image displayed on the display unit 207 at that time based on the operation description of the operation condition determination unit 208 and the unit of the unit storage unit 205. Since the operation conditions are prepared for each piece of graphics information (geometric shape), the video generation unit 204 can change the image for each piece of graphics information.

The operation of the digital broadcast receiving apparatus according to the first embodiment of the present invention configured as described above will be described below. FIG. 4A is a display example when the operation description 202 of FIG. 2 is executed by the present apparatus. FIGS. 9B and 9C show two images for changing the unit 103 d stored in the unit storage unit 205.

In the state where an image is displayed in (a), the operation of the viewer shown in FIG.
Is input from the viewer input unit 209 to the operating condition determining unit 208, the operating condition determining unit 208
6 to the operation description "change the position coordinates from the coordinate X to the Y while displaying the image alternately using the two units 1 and 2 of the unit 103d" shown in FIG.

The operation condition judging section 208 interprets this operation description and stores the
And notifies the video generation unit 204 to perform processing as described in the operation description using the unit 103d. In response to the notification from the operation condition determination unit 208, the video generation unit 204 sequentially generates the images shown in FIG.

With the above configuration, the present digital broadcast receiving apparatus receives the data in units of blocks, such as blocks 100, 101,..., At regular time intervals, and reproduces one block each time one block is received. Therefore, it is not necessary to store all the broadcast data, and the present device can reduce the storage capacity as compared with the conventional device. (Second Embodiment) FIG. 5 shows an example of the format of broadcast data in the second embodiment and an image formed on a screen when the receiving device receives the format.

The format shown in FIG. 2 differs from that shown in FIG. 1 in that a plurality of pieces of position information are included in one block, such as position information groups 301, 302, 303,... Of image elements A to C. Each position information is transmitted at appropriate time intervals so as to match the timing to be displayed on the screen. In the figure, blanks between the position information groups 301 and 302 and between the position information groups 302 and 303 of the image elements A to C correspond to this time interval. This time interval is filled with invalid data for the receiving device. In the figure, the position information of the image elements A to C is one set, but each position information may be transmitted individually.

FIG. 6 is a block diagram showing the configuration of the digital broadcast receiving apparatus of the present embodiment. In FIG.
The components having the same reference numerals as those described above have the same functions, and thus description thereof will be omitted. Upon receiving each data in the block, the receiving unit 601 sequentially outputs the data to the data separating unit 202.

The position information storage section 603 has the functions of the position information groups
Is output from the data separation unit 202 along the time axis to the video generation unit 204. When the image generation unit 204 receives the signal S,
In accordance with the position information in the position information storage unit 203, the image is redrawn and output to the display unit 207.

The operation of the digital broadcast receiving apparatus according to the second embodiment configured as described above will be described with reference to an example of an image shown in FIG. When the position information group 301 shown in FIG. 5 is input from the data separation unit 202, the position information storage unit 603 outputs a signal S indicating this to the video generation unit 604. When the signal S is input, the video generation unit 604 receives the position information group 301 stored in the position information storage unit 603.
Is obtained, and the image 1 in FIG. 5 is formed from these and the geometric shapes 103c to 105c, and is displayed on the display unit 207.

Thus, the position information groups 302 and 30
3 is sequentially input to the position information storage unit 603,
The position information storage unit 603 sequentially outputs the signal S to the video generation unit 604, and the video generation unit 604 having received the signal S
Images 2 and 3 are formed by sequentially acquiring the position information 302 and 303 from the position information storage unit 603. As described above, the present receiving apparatus repeats image formation each time the position information is stored in the position information storage unit 603.

In FIG. 5, the position information groups 301 to 30
As shown in FIG. 3, the position information of all image elements is one set, but individual position information may be transmitted at individual timing. (Third Embodiment) FIG. 7 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to a third embodiment.

In the figure, the digital broadcast receiving apparatus is configured to discard the next block to be formed when the image forming process is slow. The components having the same reference numerals as those in FIG. 3 are the same, and the description thereof will be omitted. The video generation unit 704 includes the video generation unit 20
In addition to the function of the fourth embodiment, a signal S1 = 1 is output to the display control unit 710 during the image formation between the start of the image formation of the initial image and the completion of the image formation. When the image is not being formed, the video generation unit 704 outputs the signal S1 = 0 to the display control unit 710.

The receiving unit 701 notifies the display control unit 710 that one block has been stored in the internal buffer, in addition to the function of the receiving unit 201. That is, the receiving unit 701 outputs a signal S2 = 1 indicating that one block has been stored in the internal buffer, and outputs a signal S2 = 0 to the receiving unit 701 during the storage of other blocks. Output.

The receiving unit 701 includes a display control unit 710
Thus, when the signal S3 = 1 is received, the block is discarded and the next block is stored. While the signal S3 = 0, the block that has been stored is output to the data separation unit 202. When the display control unit 710 receives the signal S2 = 1 indicating that the block has been stored from the reception unit 701 while the signal S1 = 1 indicating that the image is being formed is input from the video generation unit 704, the display control unit 710 receives the signal. A signal S3 = 1 for causing the block 701 to discard the block in the buffer is output. Otherwise, signal S3 = 0 is output to receiving section 701.

The operation of the digital broadcast receiving apparatus of the present embodiment configured as described above will be described below.
8 is a case where the buffer accumulated by the receiving unit 701 is output to the data separating unit 202 without discarding it. A case 2 is a case where the block for the image 2 accumulated by the receiving unit 701 is discarded. The display state of the display unit 207 is shown for each lapse of time.

In Case 1, after forming the image 1, the video generator 704 outputs a signal S1 = 0 to the display controller 710. That is, the video generation unit 704 indicates to the display control unit 710 that the image formation has been completed and the image formation is not being performed. Next, the receiving unit 701 outputs to the display control unit 710 a signal S2 = 1 indicating that the block for image 2 has been stored in the buffer.

Then, the display control unit 710 controls the image generation unit 7
In a state where the signal S1 = 0 is input from the input unit 04, the signal S2 = 1 is received from the receiving unit 701. Therefore, it is not necessary for the receiving unit 701 to discard the block.
Therefore, the receiving unit 7 continues to output S3 = 0 previously output.
Output to 01. Since S3 = 1 is not input from the display control unit 710, the reception unit 701 outputs the stored block 2 to the data separation unit 202 without discarding it.

Thereafter, the image 2 is formed in the video generation unit 704. When the receiving unit 701 finishes receiving the block for the image 3, the same operation as described above is performed. In Case 2, the video generation unit 704 outputs a signal S1 = 1 indicating that an image is being formed to the display control unit 710.

The receiving section 701 outputs to the display control section 710 a signal S2 = 1 indicating that the block for image 2 has been stored in the buffer. The display control unit 710 receives the signal S2 = 1 from the reception unit 701 when the signal S1 = 1 is input from the video generation unit 704. Here, if the receiving unit 701 outputs the block for the image 2 to the data separation unit 202 as it is, the process proceeds to the formation of the image 2 without completing the formation of the image 1. Therefore,
The display control unit 710 outputs the signal S3 = 1 to the receiving unit 701, and causes the block for the image 2 stored in the buffer to be discarded.

After discarding the block for image 2, the receiving unit 701 receives the next block for image 3 and stores it in the buffer. In this way, the same operation as described above is performed when the receiving unit 701 stores blocks for the image 3.
As described above, even when the image forming process by the video generating unit 704 is slower than the block receiving / accumulating by the receiving unit 701, the receiving device of the present embodiment can perform the next image forming process without completing the image forming process. It is configured so that processing does not proceed. (Fourth Embodiment) FIG. 9 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to a fourth embodiment.

In the figure, the components having the same reference numerals as those in FIG. 3 are the same, and the description thereof will be omitted. The video generator 504, the receiver 501, and the display controller 5, which are different components, will be described below.
10 will be described. The video generation unit 504 has the following functions in addition to the functions of the video generation unit 204.

The image generation unit 504 has a first mode for drawing without reducing the accuracy of the geometric shape and a second mode for drawing with reduced accuracy. This switching is instructed by the display control unit 510. Upon receiving this instruction, the video generation unit 504 draws an image in the instructed mode after the next block. In order to receive the mode switching control, the video generation unit 504 outputs a signal S7 = 1 from the start of image formation to the completion of image formation, and otherwise outputs S7 = 0 to the display control unit 510, and performs drawing. Notify whether it is in the middle or not.

The receiving section 501 notifies the display control section 510 of a signal S6 indicating that data of one block has been received. The display control unit 510 receives a signal S6 indicating that the reception of one block of data has been completed from the reception unit 501, and a signal S7 indicating whether or not drawing is being performed from the video generation unit 504. Then, the signals S6 and S7 are compared, and
If S7 = 1 (indicating that drawing is in progress) when
Assuming that the rendering process by the video generation unit 504 is slower than the reception of the block, the video generation unit 504 is instructed to switch the rendering mode to the second mode with higher accuracy.

FIG. 10 shows an example of an image when the image generation unit 504 draws data of the same geometric shape in the first mode (A) and a case where it is drawn in the second mode (B). The geometric shape is composed of coordinate data of each vertex of the polygon, data indicating whether or not the polygon is to be painted, color data for painting. When the display control unit 510 instructs to draw in the first mode, the image generation unit 504
Draws image A using all geometric data.

When the display control unit 510 instructs drawing in the second mode, the image B is drawn after thinning out the coordinate data of the geometric shape at a predetermined ratio. In the example of the image B, it is thinned out to about half. (Fifth Embodiment) Each piece of position information in a block received by the digital broadcast receiving apparatus of the fifth embodiment includes layer information indicating a drawing layer in addition to coordinates indicating an initial arrangement position on a screen.

FIG. 11 is a block diagram showing the configuration of a digital broadcast receiving apparatus according to the fifth embodiment. In the figure, components having the same reference numerals as those in FIG. 3 have the same functions, and therefore description thereof will be omitted.
4, the layer control unit 814, the operation condition determination unit 808, and the viewer input unit 809 will be mainly described.

The image generation unit 804 has a layer control unit 814 inside, forms each image element from each geometric shape input from the data separation unit 202, and stores the position information storage unit 203.
Is obtained, and the image elements are combined by arranging the image elements on the layer specified by the layer control unit 814 to form a display image. Layer control unit 814
Extracts and stores the layer information for the initial image from the position information storage unit 203, and controls the layer of the image element based on the layer information.

The layer control section 814 includes the operation condition determination section 8
When a layer change instruction is received from step 08, the layer of the image element is changed according to the instruction. Viewer input unit 80
Reference numeral 9 denotes an operation condition determining unit 808 which receives an operation of changing an image layer in addition to the function of the viewer input unit 209.
Notify. The operation condition determination unit 808 includes the viewer input unit 8
When the notification of the layer change is received from 09, the layer control unit 814 is notified of which image is to be changed.

FIG. 12 shows display images 1 and 2 formed according to the layer information and respective image elements A and
It is the figure which expressed the structure of the layer of B and C like an image. When the image 1 is displayed, the viewer input unit 809 is displayed.
Upon receiving an operation of changing the layer of the image element C, the operation condition determination unit 808 notifies the layer control unit 814 that the Kao diagram element C is to be changed.

The notified layer control unit 814 changes the value of the layer information of the image element C from 3 to 1, and changes the image elements having the layer information values of 1 and 2 to 2 and 3, respectively. The video generation unit 804 forms an image in which image elements are rearranged according to the changed layer information.

[0051]

According to the present invention, there is provided a receiving apparatus for receiving broadcast data broadcast in units of blocks, wherein each of the blocks includes a plurality of pieces of graphics information representing an image element to be displayed on a screen. Position data indicating the arrangement position of the initial image element above, graphics data indicating the shape of the initial image element, and processing data, the processing data includes operation data indicating a viewer operation and a changed part of the graphics data. The receiving device is adapted to receive the broadcast data, storing means for storing one block of the received broadcast data, and the position data and the graphics data taken out from the storage means. Display image forming means for forming a display image of one screen, accepting means for receiving an operation of a viewer, and processing of the storage means Comprising search means for searching the change data corresponding to the viewer operation the receiving unit receives the broadcast, and control means for controlling to change the display image on the display image forming means in accordance with the retrieved the changed data. As a result, reception, storage, and image formation of each block of broadcast data can be realized, so that the capacity of the buffer (storage unit) can be reduced, and all broadcast data can be received. Even if it does not end, there is an effect that the first block can be reproduced immediately after being stored by the storage means. Further, the present digital broadcast receiving apparatus can form a display image according to the operation of the viewer.

Further, the graphics information includes a plurality of position data, and the plurality of position data indicate arrangement positions of image elements different from each other, and are transmitted at a timing at which the arrangement positions of the image elements are to be changed. When the position data is received and stored in the storage unit, the control unit causes the display image forming unit to change the arrangement position of the image element. As a result, the digital broadcast receiving apparatus forms an image in accordance with the transmission timing of the position data. Therefore, even if reception of one program is not completed, it is possible to reproduce a program that changes every moment during reception of broadcast data. There is an effect that can be.

[0053] The digital broadcasting apparatus further includes a judging means for judging whether or not the display image forming means has completed the formation of the display image of the current block when the new block is received by the receiving means. If it is determined that the new block, the new block is stored in the storage means,
A continuation unit that causes the receiving unit to discard the new block when it is determined that the display is not completed, and causes the display image forming unit to continue forming the display image of the current block. Accordingly, when the display image is being formed by the display image forming means, the receiving means discards the new block and receives the next block. This has the effect of preventing the problem of moving to.

The display image forming means has a first mode for drawing without deteriorating the precision of the graphics data and a second mode for drawing with deteriorating the precision of the graphics data. And a mode designating unit for designating the first mode or the second mode to the display image forming unit. As a result, the present digital broadcast receiving apparatus has an effect that a program can be reproduced with a reproduction time similar to that of an apparatus having a high drawing processing capability, even if the drawing processing capability is low.

[0055] The position data further includes layer information indicating a drawing layer of graphics data, and the display image forming means includes a storage unit for individually storing images formed from the graphics data of each piece of graphics information;
A forming unit that forms a display image from the layer and the image of the storage unit, wherein the receiving unit receives a request to change the layer information of any graphic data from a viewer, and the control unit The display image of the forming unit is changed according to the layer information change instruction received from the receiving unit. Thus, the present digital broadcast receiving apparatus has an effect that the viewer can change the layer of the image element in addition to the same effect as described above.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a format of broadcast data received by a digital broadcast receiving device according to a first embodiment.

FIG. 2 is a diagram showing an example of an operating condition in a table format.

FIG. 3 is a block diagram illustrating a configuration of a digital broadcast receiving device according to the present embodiment.

FIG. 4 (a) is a display example when the operation description 202 of FIG. 2 is executed by the present apparatus. (B), (c) It is a figure which shows the image for two changes of the unit 103d accommodated in the unit storage part 205.

FIG. 5 is an example of a format of broadcast data and an image formed on a screen when the receiving device receives the format in the second embodiment.

FIG. 6 is a block diagram illustrating a configuration of a digital broadcast receiving device according to the present embodiment.

FIG. 7 is a block diagram illustrating a configuration of a digital broadcast receiving device according to a third embodiment.

FIG. 8 is a diagram showing a display image for each elapse of time.

FIG. 9 is a block diagram illustrating a configuration of a digital broadcast receiving device according to a fourth embodiment.

FIG. 10 is a diagram showing an example of the data of the same geometric shape.
4 is an example of an image when the image is drawn in the first mode (A) and an image when the image is drawn in the second mode (B).

FIG. 11 is a block diagram illustrating a configuration of a digital broadcast receiving device according to a fifth embodiment.

FIG. 12 is a diagram schematically illustrating a display image 1 and 2 formed according to layer information and a layer structure of respective image elements A, B and C.

[Explanation of symbols]

 201 reception unit 202 data separation unit 203 position information storage unit 204 video generation unit 205 unit storage unit 206 operation condition storage unit 207 display unit 208 operation condition determination unit 209 viewer input unit

Claims (5)

[Claims] 1. A receiving apparatus for receiving broadcast data broadcast in units of blocks, wherein the blocks include a plurality of pieces of graphics information representing image elements to be displayed on a screen, and each piece of graphics information is a screen. Position data indicating the arrangement position of the initial image element above, graphics data indicating the shape of the initial image element, and processing data, the processing data includes operation data indicating a viewer operation and a changed part of the graphics data. The reception device receives broadcast data, a storage unit for storing one block of the received broadcast data, and a position data and graphics data extracted from the storage unit. Display image forming means for forming a display image of one screen, receiving means for receiving a viewer operation, and storage means Search means for searching for change data corresponding to the viewer operation received by the receiving means from the management information, and control means for controlling the display image forming means to change a display image according to the searched change data. The digital broadcast receiving device according to claim 1, wherein: 2. The graphics information includes a plurality of position data, wherein the plurality of position data indicate arrangement positions of image elements different from each other, and are transmitted according to a timing at which the arrangement positions of the image elements are to be changed. 2. The digital broadcast receiving apparatus according to claim 1, wherein said control means causes said display image forming means to change an arrangement position of an image element when position data is received and stored in said storage means. 3. The digital broadcasting device further includes: a determination unit configured to determine, when a new block is received by the receiving unit, whether display image formation of the current block is completed by the display image forming unit. If it is determined that the block has been completed, the new block is stored in the storage unit, and if it is determined that the block has not been completed, the new block is discarded by the receiving unit, and the display image of the current block is displayed. The digital broadcasting device according to claim 1, further comprising: a continuation unit that causes the display image forming unit to continue the formation. 4. The display image forming means has a first mode for drawing without deteriorating the precision of graphics data, and a second mode for drawing with deteriorating the precision of graphics data. 2. The digital broadcast apparatus according to claim 1, further comprising a mode designating unit for designating a first mode or a second mode to the display image forming unit. 5. The position data further includes layer information indicating a drawing layer of graphics data, and the display image forming means individually stores an image formed from the graphics data of each piece of graphics information. And a forming unit that forms a display image from the layer and the image in the storage unit, wherein the receiving unit receives a request to change layer information of any graphic data from a viewer, and the control unit 2. The digital broadcast receiving apparatus according to claim 1, wherein a display image of said forming unit is changed according to a layer information change instruction received from said receiving unit.