JPH09159478A - Navigation device and navigation method - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a navigation device and a navigation method that enhance the safety of vehicle operation by displaying only necessary traffic data. SOLUTION: A position data calculating means 61 for calculating position data, a traveling direction calculating means 65 for calculating a traveling direction of a vehicle from the position data, and a traveling direction area calculating means for calculating a traveling area from the traveling direction and position data. 66, a traveling direction area place name searching means 67 for searching a place name in the traveling direction area, a traffic data searching means 62 for searching traffic data corresponding to the traveling direction area, and comparing the place name and the traffic data. Traffic data / place name comparison / determination means 68 for selecting traffic data including the place name, map data search means 63 for searching map data, etc., and data input / output means 64 for displaying the selected traffic data, etc. Have.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device and a navigation method for safely and efficiently guiding a vehicle such as an automobile to a destination.

[0002]

2. Description of the Related Art FIG. 7 is a device block diagram showing a conventional navigation device. In FIG. 7, the positioning receiver 1
Receives the positioning data necessary for the positioning calculation transmitted from the positioning satellite, and the FM multiplex broadcast receiving unit 2 receives the FM multiplex signal transmitted from the traffic information center via the FM broadcasting station, decodes the FM multiplex signal, and transmits the traffic. Obtain data indicating information (hereinafter referred to as "traffic data"). The CD-ROM unit (read-only storage means) 3 stores map data, map-related data (map-related data), and the like. The storage unit (random access storage means) 4 stores position data and FM obtained from measurement data.
The traffic data obtained by decoding the FM multiplex signal received by the multiplex broadcast receiving unit 2 is stored, and the display unit 5 displays position data, traffic data, and map data. The control unit 6 calculates position data from the positioning data, reads the data stored in the storage unit 4 and the map data stored in the CD-ROM unit 3, and displays the data on the display unit 5.

FIG. 8 is a functional block diagram showing a control unit of a conventional navigation device. In FIG. 8, the position data calculation means 61 calculates position data from the positioning data transmitted from the positioning satellite, and the traffic data search calculation means 62.
Causes the storage unit 4 to store the traffic data from the FM multiplex broadcast receiving unit 2. The map data searching means 63 searches the map data and the map-related data stored in the CD-ROM section 3 for necessary items based on the position data. The data input / output unit 64 causes the display unit 5 to display position data, traffic data, and map display data.

The operation of the navigation device configured as described above will be described with reference to FIGS. 9 to 12. 9 is a flow chart showing the position data calculation process in the control unit of FIG. 8, FIG. 10 is a flow chart showing the traffic data process in the control unit of FIG. 8, and FIG. 11 is a data display diagram showing a display example by the control unit of FIG. FIG. 12 is a flowchart showing a display process in the control unit of FIG.

First, the position data calculation process will be described. In FIG. 9, the position data calculation means 61 inputs the positioning data from the positioning receiver 1 via the data input / output means 64 (S1), and calculates the position data, that is, the current position data from the input positioning data (S2). ), The calculated position data is stored in the storage unit 4 via the data input / output unit 64 (S3). The position data stored in the storage unit 4 is displayed on the display unit 5 via the data input / output unit 64.

Next, the traffic data processing will be described. In FIG. 10, the traffic data search means 62 inputs the traffic data from the FM multiplex broadcast receiving section 2 via the data input / output means 64 (S11), and stores the input traffic data in the storage section 4 via the data input / output means 64. (S12). The traffic data stored in the storage unit 4 is data input / output means 64.
Is displayed on the display unit 5 via. The position data and the traffic data are stored in the storage unit 4 in association with each other.

FIG. 11 is a data display diagram showing a display example of position data, traffic data and map data on the display unit 5.

Next, a display process of map data, position data and traffic data will be described.

In FIG. 12, map data search means 63
Causes the CD-ROM unit 3 to search the map data corresponding to the position data, and causes the display unit 5 to display the searched map data via the data input / output unit 64 (S21). Next, the position data calculation means 61 causes the display part 5 to display the required position data, that is, the necessary past position data from the storage part 4 via the data input / output means 64 based on the current position data (S22). ). Next, the traffic data search means 62 determines whether or not there is traffic data that has not yet been displayed among the traffic data corresponding to the required position data (S23, S24). If it is determined that there is traffic data, the corresponding traffic data is read from the storage unit 4 (S2
5) Display via the data input / output means 64 (S2)
6). When it is determined that there is not, the display process ends. In this way, the user can operate the vehicle while checking the current position data and traffic data such as traffic jams, accidents, regulations, presence / absence of parking lots, etc. around the current position data on the map.
In this way, the user can obtain the traffic information of the current position and its surroundings on one screen by the position data calculation process (FIG. 9), the traffic data process (FIG. 10), and the display process (FIG. 12). .

[0010]

However, since the FM broadcasting station in the traffic information system utilizing FM multiplex broadcasting transmits wide area information, the above conventional navigation apparatus cannot use the traffic data which the user does not need. It also had a problem that it would be received. For example, the user is currently in A city, and the FM broadcasting station has A city and B
If you are broadcasting traffic data for C and C cities, the user is A
The traffic data other than the city will also be received, and the traffic data not needed by the user will also be received, stored, and displayed. This is a waste of memory and displays unnecessary traffic data for the user. The more data that the navigation device sees while the vehicle is operating, the more dangerous it is, so unnecessary data should not be displayed as much as possible.

This navigation device is required to display only necessary traffic data.

The present invention provides a navigation device that enhances the safety of vehicle operation by displaying only necessary traffic data, and a navigation method that enhances the safety of vehicle operation by displaying only necessary traffic data. The purpose is to do.

[0013]

In order to solve this problem, the present invention provides a position data calculating means for calculating position data from positioning data transmitted from a positioning satellite, and a traveling direction of a vehicle from the position data. Traveling direction calculation means for
A traveling direction area calculating means for calculating a traveling direction area based on the traveling direction and position data, a traveling direction area place name searching means for searching a read-only storage means for a place name in the calculated traveling direction area, and a random access Among the traffic data from the road traffic center stored in the storage means, the traffic data search means for searching the traffic data corresponding to the traveling direction area is compared with the place name in the traveling direction area and the searched traffic data for retrieval. Traffic data / place name comparison / determination means for selecting traffic data containing place names in the traveling direction area retrieved from the retrieved traffic data, and map data and map-related data stored in the read-only storage means Of the map data and map-related data that correspond to the traveling direction area of the Is obtained by configured to have a data output means for displaying the data as retrieved map data and map-related data.

As a result, it is possible to obtain a navigation device which enhances the safety of vehicle operation by displaying only necessary traffic data.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention calculates position data from a positioning data transmitted from a positioning satellite, and position data calculating means to calculate the traveling direction of a vehicle from the position data. A traveling direction calculating means, a traveling direction area calculating means for calculating a traveling direction area based on the traveling direction and position data, and a place name in the traveling direction area for retrieving a place name in the calculated traveling direction area from the read-only storage means Retrieval means, traffic data retrieval means for retrieving traffic data corresponding to the traveling direction area from traffic data from the road traffic center stored in the random access storage means, traveling direction area stored in the read-only storage means The place name in the area is compared with the searched traffic data, and the traffic data that includes the place name in the traveling direction area searched in the searched traffic data is selected. Traffic data / place name comparison / determination means, map data retrieval means for retrieving map data and map-related data corresponding to the traveling direction area from the map data and map-related data stored in the read-only storage means, and position data And the selected traffic data and the data input / output means for displaying the searched map data and the map-related data, and the traffic data including the place name in the searched traveling direction area. That is, there is an effect that only traffic data related to vehicle operation is displayed.

According to a second aspect of the present invention, the position data calculating means for calculating the position data from the positioning data transmitted from the positioning satellite and the route setting points such as the destination point and the relay point are retrieved from the read-only storage means. Among the traffic data from the road traffic center stored in the route setting point search means, the route setting point place name searching means for searching the place name of the searched route setting point from the read-only storage means, and the random access storage means The traffic data search means for searching the traffic data corresponding to the route setting point and the place name of the route setting point are compared with the searched traffic data, and the place name in the traveling direction area searched in the searched traffic data is Traffic data to select included traffic data
The place name comparison and determination means, the map data search means for searching the map data and the map related data corresponding to the route setting point among the map data and the map related data stored in the read-only storage means, and the position data are selected. The data input / output means for displaying the traffic data and the searched map data and the map-related data is provided, and the traffic data including the place name in the searched traveling direction area, that is, the vehicle operation. Has the effect that only the traffic data related to is displayed.

According to a third aspect of the invention, a position data calculating step of calculating position data from positioning data transmitted from a positioning satellite, a traveling direction calculating step of calculating a traveling direction of the vehicle from the position data, and a traveling direction. A traveling direction area calculating step for calculating the traveling direction area based on the direction and position data, a traveling direction area place name searching step for retrieving a place name in the calculated traveling direction area from the read-only storage means, and a random access storage Among the traffic data from the road traffic center stored in the means, the traffic data search step for searching the traffic data corresponding to the traveling direction area and the traffic data searched in the traveling direction area are compared and searched. Traffic data / place name comparison that selects the traffic data that includes the place name in the traveling direction area searched in the traffic data Determining step, a map data searching step of searching for map data and map-related data corresponding to the traveling direction area of the map data and map-related data stored in the read-only storage means, position data, and selected traffic data. And a data input / output step for displaying the searched map data and the map-related data, and the traffic data including the place name in the searched traveling direction area, that is, related to the vehicle operation. This has the effect of displaying only the traffic data to be displayed.

According to a fourth aspect of the invention, a position data calculating step of calculating position data from positioning data transmitted from a positioning satellite, and a route setting point such as a destination point and a relay point are retrieved from the read-only storage means. Of the traffic data from the road traffic center stored in the random access storage means and the route setting location search step for searching the location name of the searched route setting location from the read-only storage means The traffic data search step for searching the traffic data corresponding to the route setting point and the place name of the route setting point and the searched traffic data are compared, and the place name in the traveling direction area searched in the searched traffic data is Traffic data / place name comparison / determination step for selecting included traffic data, and stored in read-only storage means. Map data and map-related data, the map data search step for searching the map data and map-related data corresponding to the route setting point, the position data, the selected traffic data, and the searched map data and the map-related data. It has a data input / output step to be displayed, and has an effect of displaying only traffic data including a place name in the searched traveling direction area, that is, traffic data related to vehicle operation. .

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a functional block diagram showing a control unit 6 of a navigation device according to an embodiment of the present invention. 1, the positioning receiver 1, the FM multiplex broadcast receiver 2, the CD-ROM unit 3, the storage unit 4, the display unit 5, the position data calculation means 61, and the data input / output means 64 are the same as those in FIG. , Description is omitted. Traveling direction calculation means 65
Calculates the traveling direction of the vehicle from the position data. The traveling direction area calculating unit 66 calculates the traveling direction area based on the traveling direction and the position data. The traffic data search means 62 searches the traffic data from the road traffic center stored in the random access storage means (storage unit) 4 for the traffic data corresponding to the traveling direction area. The traveling direction area place name searching means 67 retrieves the place name in the traveling direction area from the read-only storage means (CD-ROM section) 3. The traffic data / place name comparison / determination means 68 compares the place name in the traveling direction area stored in the CD-ROM section 3 with the retrieved traffic data, and selects one of the traffic data related to vehicle operation.
The map data search means 63 searches the map data and the map-related data stored in the read-only storage means 3 for the map data and the map-related data corresponding to the traveling direction area.

The operation of the navigation device configured as described above will be described with reference to FIGS. 2 and 4.
2 is a flowchart showing a process of calculating the traveling direction area by the control unit of FIG. 1, and FIG. 4 is a flowchart showing a display process of the control unit of FIG. A process of calculating position data from the positioning data transmitted from the positioning satellite (position data calculation step), and the traffic data search means 62 inputs the traffic data from the FM multiplex broadcast receiving unit 2 and stores it in the storage unit 4. The processing to be performed is similar to the conventional one (FIG. 9,
(See FIG. 10).

First, the traveling direction area calculation processing is shown in FIG.
This will be described with reference to FIG. It is assumed that the storage unit 4 stores a plurality of position data at an arbitrary fixed time, that is, past current position data. When the fixed time has passed, the position data calculation unit 61 reads out a plurality of position data from the storage unit 4 (S31), and the traveling direction calculation unit inputs a plurality of position data from the position data calculation unit 61 and calculates the current position from the current position. The traveling direction of is calculated by an approximate expression (S32, traveling direction calculation step). Then, a fan-shaped area in an arbitrary range including the traveling direction with the current position as the center and the distance that the FM multiplex broadcast reaches as the radius is set as the traveling direction area (S33, traveling direction area calculation step). FIG. 3 is a traveling direction area map showing an example of the traveling direction area by the control unit of FIG. In FIG.
7 is the traveling direction, 8 is the traveling direction area, 9 is the current position, 10
Is a search area, and 11 is a locus of the past current position.

Next, the display process will be described with reference to FIG. First, the position data calculation means 61 reads the plurality of position data from the storage unit 4 (S41). Next, the traveling direction area place name searching means 67 reads out the place name in the traveling direction area obtained in step 33 from the CD-ROM section 3 based on the plurality of position data (S42, traveling direction area place name). Search step). Next, the traffic data search means 62 determines whether there is unsearched traffic data based on the plurality of position data (S43). When it is determined that there is, the traffic data search means 62 reads out unsearched traffic data from the storage unit 4 (S44, traffic data search step), and the traffic data / place name comparison determination means 68.
Compares the traffic data with the place name in the traveling direction area and determines whether the traffic data includes the place name in the traveling direction area (S45, traffic data / place name comparison determining step). Traffic data / place name comparison / determination means 68
If it is determined that the traffic data is included, the traffic data search means 62 displays the traffic data on the display unit 5 via the data input / output means 64 (S46, data input / output step). When it is determined that the traffic data / place name comparison determining means 68 is not included, the traffic data searching means 62 does not display the traffic data. When there are a plurality of traffic data in this way, each traffic data is compared with the in-direction area place name. The position data and map data display processing (data input / output step) is the same as the conventional one. That is, the current position data and the necessary past position data are displayed, and the map data corresponding to the traveling direction area is searched (map data searching step) and displayed.
When the traffic data is not received, the current position data and the necessary past position data and the map data are superimposed and displayed on the display unit 5.

In the present embodiment, a fan-shaped area in an arbitrary range including the traveling direction with the current position as the center and the distance over which FM multiplex broadcasting reaches as the radius is defined as the traveling direction area, and the place name is included in the traveling direction area. , The process of displaying the traffic data was performed, but the fan-shaped area in the arbitrary range, which is centered at the current position and whose radius is the distance over which FM multiplex broadcast reaches, and which does not include the traveling direction, is set as the search area It may be considered that the process is not displayed. Further, in the present embodiment, the case where the CD-ROM section 3 is used as the read-only storage means is shown, but the read-only storage means is not limited to this. Further, the storage unit 4 may be any unit having a random access (write / read arbitrary) function.

As described above, according to the present embodiment, based on the current position data, a fan-shaped region of an arbitrary range including the current position as the center and the traveling direction having the radius of the FM multiplex broadcast as a radius is advanced. Since it is set as a direction area, and the corresponding traffic data is displayed only when the place name in the direction area is included in the traffic data corresponding to the direction area, only the necessary traffic data is displayed, The safety of vehicle operation can be improved.

(Second Embodiment) FIG. 5 is a functional block diagram showing a control unit 6 of a navigation device according to a second embodiment of the present invention. In FIG. 5, the positioning receiver 1,
FM multiplex broadcast receiving unit 2, CD-ROM unit 3, storage unit 4,
The display unit 5, the position data calculation means 61, and the data input / output means 64 are the same as those in FIG. The route setting point searching means 69 searches the read-only storage means 3 for route setting points such as a destination point and a relay point. The traffic data search means 62 searches the traffic data from the road traffic center stored in the random access storage means 4 for the traffic data corresponding to the route setting point. The route setting point place name searching means 70 searches the read-only storage means 3 for the place name of the searched route setting point. The traffic data / place name comparison / determination means 68 compares the place name of the route setting point with the retrieved traffic data and selects one of the traffic data related to vehicle operation. Map data search means 6
Reference numeral 3 retrieves the map data and the map-related data corresponding to the route setting point from the map data and the map-related data stored in the read-only storage means 3.

The operation of the navigation device configured as described above will be described with reference to FIG. FIG. 6 is a flowchart showing a display process in the control unit of FIG. The process of calculating position data from the positioning data transmitted from the positioning satellite (position data calculation step)
Then, the processing in which the traffic data search means 62 inputs the traffic data from the FM multiplex broadcast receiving unit 2 and stores it in the storage unit 4 is similar to the conventional process (see FIGS. 9 and 10).

By the way, in the case of route navigation performed by setting a route such as a current position, a destination and a route,
Traffic data related to the place name on the route is required. Here, a case of route navigation in which a starting point, a passing point, and a destination point are set will be described.

In the display processing of FIG. 6, first, the route setting point searching means 69 determines whether or not there is an unsearched route setting point among the route setting points such as the starting point, the passing point and the destination point. S51, S52). If there is an unsearched route setting point, the route setting point is read from the CD-ROM section 3 (S53, route setting point search step), and the place name of the route setting point is stored in the CD-ROM.
It is read from the section 3 (S54, route setting point place name search step). Next, the traffic data search means 62 determines whether or not there is unsearched traffic data corresponding to the route setting point (S55, S56). If it is determined that there is traffic data, the traffic data that has not been searched is read from the storage unit 4 (S5
7. Traffic data search step), the traffic data / place name comparison / judgment means 68 compares the traffic data read from the storage unit 4 and input from the traffic data search means 62 with the place name of the route setting point, and the traffic data It is determined whether the place name is included (S58, S59, traffic data /
Place name comparison judgment step). When it is determined that the traffic data is included, the traffic data is displayed on the display unit 5 (S60, data input / output step), and when it is determined that the traffic data is not included, the traffic data is not displayed. Step 55,
When it is determined in 56 that there is no unsearched traffic data, it is again determined whether or not there is an unsearched route setting point (S56, S51, S52). If there is an unsearched route setting point, the above processing is repeated. When there is no unsearched route setting point, the display processing ends. In this way, whether or not the place name of the route setting point is included in the traffic data is determined for all the place names and traffic data related to vehicle operation, and only the included traffic data is displayed on the display unit 5. The position data and map data display processing (data input / output step) is the same as the conventional one. That is, the current position data and the necessary past position data are displayed, and the map data corresponding to the route setting point is searched (map data searching step) and displayed. When the traffic data is not received, the current position data and the necessary past position data and the map data are superimposed and displayed on the display unit 5.

Here, the route setting points and traffic data will be described. If the vehicle such as a car is not far from the starting point, the place names of the starting point, the passing point, and the destination are read from the CD-ROM section 3, respectively. When departing from the starting point, that is, after the departure, traffic data at the starting point is not necessary. In addition, when passing through the set passing point, the traffic data related to the passing point is not necessary. Therefore, the processing for the starting point and the passing point is not performed. On the other hand, since traffic data related to the vicinity of the current location is required, in this case, traffic data related to the current location, unpassed points, and destination points are selected.

Although the present embodiment has shown the case where the CD-ROM section 3 is used as the read-only storage means,
If it is read-only, it is not limited to this.
Further, the storage unit 4 may be any unit having a random access (write / read arbitrary) function.

As described above, according to the present embodiment, the traffic data / place name comparison determining means 68 determines whether the place name of the route setting point is included in the traffic data corresponding to each point, and the route name is included. Since the traffic data is displayed only when there is traffic, only the necessary traffic data is displayed, and the safety of vehicle operation can be improved.

[0032]

As described above, according to the navigation apparatus of the present invention, only the traffic data including the place name in the traveling direction area or only the traffic data including the route setting point place name are displayed. Because you can
Only the required traffic data is displayed, which has the advantageous effect of improving the safety of vehicle operation.

Further, according to the navigation method of the present invention, only the traffic data including the place name in the traveling direction area or only the traffic data including the route setting point place name is displayed, which is necessary. It is possible to obtain an advantageous effect of increasing the safety of vehicle operation by displaying only the traffic data.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a control unit of a navigation device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a process of calculating a traveling direction area in the control unit of FIG.

FIG. 3 is a traveling direction area map showing an example of the traveling direction area by the control unit of FIG.

FIG. 4 is a flowchart showing a display process in the control unit of FIG.

FIG. 5 is a functional block diagram showing a control unit of a navigation device according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing a display process in the control unit of FIG.

FIG. 7 is a device block diagram showing a conventional navigation device.

FIG. 8 is a functional block diagram showing a control unit of a conventional navigation device.

9 is a flowchart showing a position data calculation process in the control unit of FIG.

FIG. 10 is a flowchart showing traffic data processing in the control unit of FIG.

FIG. 11 is a data display diagram showing a display example by the control unit of FIG.

FIG. 12 is a flowchart showing display processing in the control unit of FIG.

[Explanation of symbols]

 1 Positioning Receiving Section 2 FM Multiplex Broadcasting Receiving Section 3 CD-ROM Section (Read-Only Storage Means) 4 Storage Section (Random Access Storage Means) 5 Display Section 6 Control Section 61 Position Data Calculating Means 62 Traffic Data Searching Means 63 Map Data Searching means 64 Data input / output means 65 Moving direction calculating means 66 Moving direction area calculating means 67 Moving direction area place name searching means 68 Traffic data / place name comparison judging means 69 Route setting point searching means 70 Route setting point place name searching means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G08G 1/0969 G06F 15/40 370C G09B 29/00 15/62 335

Claims (4)

[Claims] 1. A position data calculation means for calculating position data from positioning data transmitted from a positioning satellite, a traveling direction calculation means for calculating a traveling direction of a vehicle from the position data, the traveling direction and the position data. A traveling direction area calculating means for calculating the traveling direction area on the basis of the traveling direction area; a traveling area inside place name searching means for retrieving a place name in the calculated traveling direction area from the read-only storage means; The traffic data searching means for searching the traffic data corresponding to the traveling direction area out of the traffic data from the road traffic center, and the search by comparing the place name in the traveling direction area with the searched traffic data. Traffic data for selecting the traffic data including the place name in the searched traveling direction area among the retrieved traffic data
Place name comparison and determination means, map data search means for searching map data and map related data corresponding to the traveling direction area among the map data and map related data stored in the read-only storage means, and the position data A navigation device comprising: the selected traffic data, and data input / output means for displaying the retrieved map data and map-related data. 2. A position data calculating means for calculating position data from positioning data transmitted from a positioning satellite, and a route setting point searching means for searching a read setting storage means for a route setting point such as a destination point and a relay point. , A route setting point place name searching means for searching the retrieved place name of the route setting point from the read-only storage means, and the route setting point of the traffic data from the road traffic center stored in the random access storage means. A traffic data search means for searching the corresponding traffic data and a place name of the route setting point and the searched traffic data are compared, and a place name in the searched traveling direction area is found in the searched traffic data. Traffic data / place name comparison / determination means for selecting included traffic data, and map data stored in the read-only storage means. And map data searching means for searching map data and map related data corresponding to the route setting point among the map related data, the position data, the selected traffic data, the searched map data and map related data. Navigation device having data input / output means for displaying. 3. A position data calculating step of calculating position data from positioning data transmitted from a positioning satellite, a traveling direction calculating step of calculating a traveling direction of a vehicle from the position data, the traveling direction and the position data. A traveling direction area calculating step for calculating the traveling direction area based on the following, a traveling direction area place name searching step for retrieving a place name in the calculated traveling direction area from the read-only storage means, and storing in a random access storage means A traffic data search step of searching for traffic data corresponding to the traveling direction area from among the traffic data from the road traffic center, and a place name and the place name in the traveling direction area stored in the read-only storage means. The place name within the searched traveling direction area is included in the searched traffic data by comparing with the traffic data. Traffic data / place name comparison / determination step of selecting traffic data, and map data for searching map data and map-related data corresponding to the traveling direction area among the map data and map-related data stored in the read-only storage means. A navigation method comprising a search step, and a data input / output step for displaying the position data, the selected traffic data, the searched map data and map-related data. 4. A position data calculating step of calculating position data from positioning data transmitted from a positioning satellite, and a route setting point searching step of searching a read-only storage means for route setting points such as a destination point and a relay point. A route setting point place name searching step of searching the place name of the searched route setting point from the read-only storage means, and the route setting point in the traffic data from the road traffic center stored in the random access storage means. A traffic data search step of searching for the corresponding traffic data, and comparing the place name of the route setting point with the searched traffic data, the place name in the searched traveling direction area in the searched traffic data is And a traffic data / place name comparison / determination step for selecting included traffic data, and the read-only storage means. A map data search step of searching for map data and map-related data corresponding to the route setting point among the stored map data and map-related data, the position data, the selected traffic data, and the searched map data And a data input / output step for displaying map-related data.