JP2000132798A - Navigation center device, navigation device, and system and method for navigation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently turn right or left in an intersection by obtaining data on intersection entering vehicles without installing beacons by intersections. SOLUTION: In front of a specific vehicle VA in its traveling direction, there is another vehicle VB which is to turn right in the same direction in the intersection C3. The vehicle VB is a black sedan and its travel route is the same with the specific vehicle VA. The movements of those vehicles VA and VB are grasped on a center side. On the center side, guide data corresponding to the movement of the vehicle VB are sent to the specific vehicle VA. On the specific vehicle VA, a vocal guidance of 'Turn right at the next intersection. It is the direction to which the black sedan precedent in the travel direction turns right. The distance between the vehicle and intersection is 30 m.' is given. The specific vehicle VA, therefore, only turns following the precedent vehicle VB at the intersection C3 and such trouble that the vehicle turns right by mistake, for example, at the intersection C2 in front of the intersection C3 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation center device, a navigation device, a navigation system, and a method suitable for a system for providing data necessary for route guidance from a center side to a moving side.

[0002]

2. Description of the Related Art Generally, when a vehicle travels straight on a road, there is no particular obstacle to traveling without much guidance information. However, when changing the course, such as when making a right or left turn at an intersection (including a junction), it is convenient to have various information such as the scenery of the intersection. In particular, if there is information on other vehicles entering the intersection, the driver can accurately grasp the situation, which is effective in preventing a mistake in changing the course or occurrence of an accident.

[0003] As a background art for obtaining such information, there is an intersection information providing apparatus disclosed in Japanese Patent Application Laid-Open No. 9-180095. This is to provide a vehicle entering an intersection with information on another vehicle that is trying to enter the intersection. Beacons are installed on the road side of the road crossing the intersection. Using these beacons, the presence of a vehicle entering the intersection is detected. The detected approach vehicle information is provided via a beacon to the vehicle that is approaching the intersection.

[0004]

However, the above-described background art is based on the following problem. As the vehicle approaches an intersection,
It is necessary to transmit the direction to enter the intersection and the direction to exit from the intersection. Since the vehicle information and the other vehicle information are exchanged via the beacon, other vehicle information cannot be acquired at an intersection where no beacon is installed. It is not satisfactory in that.

On the other hand, Japanese Patent Application Laid-Open No. Hei 10-19588 discloses a navigation system in which a map image and optimum route data necessary for guiding a vehicle to a destination are transmitted from a center (base) side to a vehicle side. Is disclosed. According to this system, communication is performed between the data transmission system on the center side and the navigation device of the vehicle on the mobile side. The data transmission system has a database that stores data necessary for guiding a vehicle to a destination. The data transmission system reads necessary data from a database based on a request from a navigation device of the vehicle and creates a map image. Further, a route search is performed to create optimal route data. The created map image and data indicating the optimum route are transmitted to the vehicle. In the navigation device of the vehicle, the corresponding display is performed based on the map image and the optimum route data transmitted from the system side.

In such a navigation system, if the intersection information is provided using the beacon, communication with the beacon side as well as the center side is required, which complicates the system. However, such information can be avoided if information on other vehicles entering the intersection is also supplied from the center side. In addition, for an intersection where no beacon is installed, it is possible to obtain information on the vehicle approaching the intersection.

The present invention focuses on the above points,
The purpose is to not install beacons at each intersection,
The purpose is to provide information on vehicles entering the intersection. Another object is to alert a driver to another vehicle and to easily change the course at the intersection.

[0008]

In order to achieve the above object, a navigation center apparatus according to the present invention comprises: data storage means for storing data for route search, route guidance, and other vehicle guidance; Route search means for performing a route search using the data of the means; guide data acquisition means for obtaining guide data on the searched route from the data storage means; and guidance data of another vehicle at an intersection and its surroundings as the data. Other vehicle data acquisition means obtained from a storage means; transmission means for transmitting the route data obtained by the route search means and each piece of guidance data obtained by the guidance data acquisition means and the other vehicle data acquisition means to a mobile side; It is characterized by having.

According to one of the main modes, the other vehicle data acquiring means acquires guidance data for another vehicle traveling in the same direction as the specific vehicle to be guided. According to another aspect, the intersection is an intersection where a specific vehicle changes a course. According to still another aspect, the other vehicle data acquisition means acquires guidance data of another vehicle when the specific vehicle changes course at an intersection.

A navigation device according to the present invention is characterized in that it receives route data and guidance data transmitted from any one of the navigation center devices to perform route guidance. Further, the navigation system of the present invention
It is characterized by including any one of the navigation center devices and the navigation device.

According to the navigation method of the present invention, a step of searching for a route on the center side; a step of extracting guidance data on the searched route; a step of extracting guidance data of another vehicle at an intersection and its vicinity;
Transmitting the route data and the guidance data to the specific vehicle; and performing route guidance on the specific vehicle based on the transmitted data.

The above and other objects, features and advantages of the present invention will be apparent from the following detailed description and the accompanying drawings.

[0013]

Embodiments of the present invention will be described below in detail. In the following embodiment, a vehicle is assumed as a moving side, and a case where the present invention is applied to an in-vehicle navigation device will be described as an example.

First, the outline of the following embodiment will be described. On the vehicle side, search basic data indicating the starting point and the destination of the route search is transmitted to the center side. On the center side, a route search is performed with reference to the database. Then, guidance data is extracted for the searched route. The searched route data and the extracted guidance data (hereinafter referred to as “route / guidance data”) are transmitted to the mobile side. On the moving side, map display and voice guidance are performed based on the route / guidance data transmitted from the center side.

In this case, the center stores route data of each vehicle, and also knows the current position of each vehicle. Then, with reference to the route data and the vehicle position, when it is determined that a plurality of vehicles enter the predetermined intersection, guidance data regarding the progress of another vehicle is transmitted to the corresponding vehicle. In the vehicle to which the other vehicle guidance data has been transmitted, guidance such as, for example, the vehicle in front turning in the same direction is performed, and the course change can be appropriately performed.

In the following description, a vehicle for which guidance regarding the progress of another vehicle is provided is referred to as a specific vehicle or a host vehicle. In addition, the guidance data regarding the progress of another vehicle is referred to as other vehicle guidance data. Also, the intersection includes a branch point.

(1) Overall Configuration First, an overall configuration of the present embodiment will be described with reference to FIG. FIG. 1 shows a configuration of a navigation system according to the present embodiment.
The navigation system according to the present embodiment includes a center device 150 on the center side and an in-vehicle navigation device 100 on the moving side.

First, the center device 150 will be described.
The communication control unit 151 is a communication device including a modem, a terminal adapter, and the like, and transmits and receives data to and from the navigation device 100. A communication system such as a car phone, a mobile phone, and a PHS may be used. The system control unit 152 includes an arithmetic processing device including a CPU and a memory. The memory includes a route search program for searching for a route from the designated departure point to the destination, a program for extracting guidance data on the searched route, a program for extracting the progress of vehicles around an intersection, and the like. Various programs executed by the device 150 are stored. Also, a working area used for executing those programs is secured in the memory.

The database 153 is a large-capacity storage medium such as a hard disk.
Data necessary for route search and route guidance, such as search data used for route search, guidance data for guiding a searched route and other vehicles, etc., are stored. The specific contents are as follows, for example. Map data: Data for displaying a map on the display of the navigation device. Road data ... As shown in FIG.
The information includes node point numbers and positions (longitude / latitude), road names, road types, road lengths, drawing data, and the like set on each road. The road drawing data may be vector data composed of a plurality of drawing coordinates or bitmap image data. Intersection data: As shown in FIG. 2 (B), an intersection number sequence, an intersection name, a position (longitude / latitude), a guidance voice for instructing a direction change direction of the intersection, a so-called landmark serving as a guide mark, Data such as the landscape of the building.
Note that the intersection includes a branch point.

Search data: Data for specifying the position (longitude and latitude) of the destination from telephone numbers, addresses, names, and the like. Vehicle characteristic data ... As shown in FIG. 2 (C), this is data indicating characteristics of each vehicle. For example, the color of the body, the type of the vehicle, and the like correspond. Voice guidance data of another vehicle at an intersection... Is set as shown in FIG. For example, if there are n other vehicles that turn right at the intersection in the same direction as the specific vehicle, voice guidance data that "There are n other vehicles with the same right turn direction at the intersection" is transmitted to the vehicle. It is.

Next, the on-vehicle navigation device 100 will be described. The arithmetic processing unit 101 is mainly composed of a CPU. The program storage unit 102 includes an arithmetic processing unit 1 such as a program for displaying a route on the display unit 106 based on the route / guidance data transmitted from the center device 100 and a program for outputting guidance voice from the voice output unit 107.
01 is a memory for storing a program to be executed.

The data storage unit 103 functions as a working area appropriately used when executing a program, and stores, for example, the following data. Route / guidance data transmitted from the center device 150, vehicle-specific ID data, vehicle position data (longitude / latitude) measured by the position measurement unit 104,

Among these, the vehicle position data includes a plurality of past position data in addition to the current position data measured at predetermined time intervals by the position measuring unit 104. For example, position data of measurement points included in a certain distance or position data of a certain number of measurement points are stored. When the position is newly measured by the position measurement unit 104, the latest position data is stored and the oldest stored position data is deleted. By connecting these plurality of position data, the traveling locus of the vehicle can be obtained.
This traveling locus is used for so-called map matching for specifying the road on which the vehicle is traveling.

Next, the position measuring unit 104 is a so-called GP
A GPS receiver that measures the position of a vehicle using S, D-GPS, etc., receives signals from a plurality of GPS satellites, measures the absolute position of the vehicle, and measures the relative position of the vehicle. Speed sensor, direction sensor, etc. Speed sensors and direction sensors are used for autonomous navigation. The relative position measured by those sensors is GP
It is used for obtaining a position in a tunnel where the S receiver cannot receive a radio wave from a satellite, or for correcting a positioning error of an absolute position measured by a GPS receiver.

The input unit 105 includes various switches, a touch panel attached to the display surface of the display unit 106, a remote controller, a data input device using voice recognition, and the like. In the touch panel, when a user touches an icon or the like displayed on the display unit 106 with a finger, corresponding data or an instruction is input. In a data input device using voice recognition, when a user utters a voice, data or a command corresponding to the voice is input.

The display unit 106 is a display such as a liquid crystal display or a CRT, and has a touch panel as described above. The transmission / reception unit 108 is a communication device for transmitting and receiving data to and from the center device 150, and includes a modem and the like. A system such as a car phone, a mobile phone, and a PHS may be used.

(2) Route Search and Guidance Data Extraction Next, the operation of route search and guidance data extraction will be described with reference to the flowchart of FIG. In the in-vehicle navigation device 100, first, the GPS data is acquired by the position measurement unit 104, and the current position (longitude / latitude) of the vehicle is measured. On the other hand, the in-vehicle navigation device 100
Using the input unit 105, the user inputs a facility name, a telephone number, or an address of the destination (step S10). Then, the current vehicle position is transmitted as departure point data, and the telephone number and address of the destination are transmitted to the center device 150 together with the vehicle ID as destination data (step S11).

These data are received by the communication control unit 151 of the center device 150 and sent to the system control unit 152. Then, the system control unit 152 determines a departure place and a destination based on the received data (step S12). First, as the starting point of the route search, an intersection at or near the current position of the vehicle is set based on the current position data of the vehicle transmitted from the vehicle-mounted navigation device 100. On the other hand, as for the destination, the database 153 is referred to, and the in-vehicle navigation device 1 is referred to.
The location of the facility corresponding to the telephone number or address transmitted from 00 is read from the database 153. Then, this read facility location or the intersection near it,
It is set as the destination of the route search.

In the center device 150, a route search is performed based on the departure point and the destination determined as described above (step S13). That is, the system control unit 1
At 52, a route search program is executed based on the data of the departure place and the destination, and a recommended route from the set departure place to the destination is searched. As a method of this route search, for example, the distance from the departure point to the destination is the shortest, the traveling time is the shortest,
Various methods are known, such as adding traffic congestion data and road construction data obtained from ICS and the like.

The search result is displayed on the vehicle side, for example, as shown in FIG. In the illustrated example, the starting point PD and the destination P
There are intersections C3 and C6 that change course with A. The distance from the departure point PD to the intersection C3 is LA
[Km], the distance from intersection C3 to intersection C6 is LB
[Km], distance from intersection C6 to destination PA is LC
[Km]. The user can grasp the outline of the searched route by referring to such a route schematic diagram.

FIG. 6 shows an example of the searched route. In FIG. 6, a portion represented by a solid line is a searched route. Further, R1 to R9 represent road numbers, and C1 to C8 represent intersection numbers. Road number R
2 represents a road between the intersection C1 and the intersection C2. The same applies to other roads. As shown in FIG. 2, the road data of each road number includes data such as node point data for road drawing and road length. The intersection data of each intersection number includes position data, a name, and the like. These data are stored in the database 153 together with the numbers. The road numbers of the routes searched in this way are as shown in FIG. 7A, and the intersection numbers are as shown in FIG. 7B. The relationship between the approach road and the escape road at each intersection is as shown in FIG. These search results are held in the system control unit 152.

Next, in the center device 150, guidance data on the route searched as described above, that is, corresponding map data, road data, and intersection data are extracted from the database 153 (step S14).
FIG. 8 shows main contents of the route data and the guidance data. First, FIG. 8A shows position data of a departure place and a destination, which are represented by latitude and longitude. FIG. 8B shows road data included in the search route, which includes a road number and various data corresponding to the road number (see FIG. 2A). FIG. 8 (C) shows intersection data included in the search route. The intersection number and various data corresponding to the intersection number (see FIG. 2 (B)) and the entry road and the exit road shown in FIG. 7 (C) are shown. Contains data. Further, the guidance data includes map data of roads and intersections, voice guidance data, landmark data serving as guide marks, landscape image data, and the like. In addition, data indicating the traveling direction or traveling route to the first course change point viewed from the guidance start position is added as necessary. If these are displayed on a map on the in-vehicle navigation device side, more accurate guidance is possible.

The searched route data and the corresponding guidance data are transmitted from the center device 150 to the vehicle-mounted navigation device 100 having the corresponding ID (step S1).
5), stored in the data storage unit 103; On the other hand, these route / guidance data are stored in the system controller 152 of the center device 150 together with the vehicle ID.

The above-described route search and guidance data extraction are performed by the center device 150 in response to a request for each vehicle. As a result, the system control unit 15 of the center device 150
2 stores the route / guidance data of each vehicle together with the ID of the corresponding vehicle. On the other hand, the current position is transmitted from each vehicle, and the current position data is also stored in the system control unit 152. FIG. 9 shows these states, and the vehicle ID, the corresponding route / guidance data, and the current position data are stored for each vehicle. The characteristic data of the corresponding vehicle is also extracted from the database 153, and similarly, the system control unit 152
Is stored in

For example, the vehicle whose vehicle ID is "UY58" is a black sedan, and the traveling route is a road number R02, R03, R0.
4,..., Intersection numbers C02, C03,. The current position is “longitude mn, latitude uy”.

(3) Route guidance... On each vehicle, guidance is executed based on the route / guidance data acquired from the center device 150 (FIG. 4, step S16). That is, guidance data corresponding to the vehicle position measured by the position measurement unit 104 is read from the data storage unit 103. Then, images and characters are displayed on the display unit 106, and sound is reproduced by the sound output unit 107. The arithmetic processing unit 101
Then, referring to the route data in the data storage unit 103, for example, the distance from the current position to the destination is calculated. The calculation result is displayed on the display unit 106. The user proceeds on the searched route while receiving the display and the voice guidance.

(4) Route Guidance at Intersections In this embodiment, the following guidance is provided especially for intersections. First, the operation of the center device will be described with reference to the flowchart of FIG. The center device 150 receives the current position data measured by the position measuring unit 104 of the vehicle-mounted navigation device 100 of each vehicle, and grasps the current position of each vehicle (step S2).
0). This operation is performed at an appropriate timing, for example, every time a predetermined time elapses or every time a predetermined distance is moved. The position data of each vehicle is stored in the system control unit 102 together with other data of the corresponding vehicle ID.

On the other hand, the system control unit 152 of the center device 150 determines whether or not the specific vehicle, that is, the vehicle to be route-guided, is within the distance L from the intersection (step S22). For these determinations, the current vehicle position data and the route data (see FIG. 9) stored in the system control unit 152 are referred to. The distance L is
It is set in the center device in advance, and indicates the start position of intersection guidance for a vehicle entering the intersection where guidance is started. For example, at the intersection C3 in FIG. 6, the following intersection guidance is started from the position M of the distance L.

When the system control unit 152 determines that the specific vehicle has entered the distance L, it is further determined whether there is another vehicle in the area around the intersection (step S23). The determination as to whether another vehicle enters or exits the relevant intersection can be made based on a table indicating the approach road and the exit road to the intersection managed for each vehicle ID (see FIG. 7C). ). The area around the intersection is, for example, the distance L × 2.
Is set as a rectangular range. Then, by comparing the diagonal position coordinates of the rectangular area with the current position data of the other vehicle, it is determined whether or not another vehicle is located within the area.

For example, in the example of FIG. 6, the peripheral area AC3
Diagonal position coordinates (Xca3, Yca3), (Xcb3, Ycb3)
Is compared with the current position of the other vehicle, and it is determined whether there is another approaching vehicle in area AC3. In addition, there is a possibility that some vehicles may escape from the intersection, but such vehicles are considered to be unlikely to be useful for guiding vehicles that are about to enter the intersection. Excluded.

As a result of the above determination, if there is another vehicle trying to enter the intersection, it is determined whether the traveling direction of the vehicle is the same as the specific vehicle (step S24). Then, if they are the same, data on the relevant other vehicle is transmitted to the specific vehicle (step S25). Specifically, data such as the number of other vehicles, the characteristic data of the other vehicles, the order of entering the intersection, the distance to the intersection, and the relative distance between the other vehicle and the specific vehicle are transmitted to the specific vehicle.

Next, the operation of the in-vehicle navigation device 100 of the specific vehicle will be described with reference to the flowchart of FIG. In the on-vehicle navigation device 100, the current position data measured by the position measurement unit 104 is transmitted to the I-
And to the center device 150 (step S3).
0). This operation is performed at an appropriate timing every time a certain time elapses or every time the vehicle travels a certain distance.

Next, when other vehicle guidance data is received from the center device 150 (step S31), it is stored in the data storage unit 103 (step S3).
2), the corresponding guidance is executed (step S33).
In addition, the guidance of the other vehicles is performed following the normal guidance at the intersection, for example, the voice guidance of "the next intersection is to the right."

Specifically, guidance as shown in FIG. 3 is performed. For example, when there are a plurality of other vehicles that make a right turn at an intersection in the same direction as a specific vehicle, a voice guidance is given that "the next intersection is to the right. If there is another vehicle turning right ahead of the specific vehicle, say, "Turn right at the next intersection.
As with the XX colored XX models traveling 20 meters ahead,
It is to the right. And so on.

(5) Specific Example FIG. 12 shows an example of another vehicle at an intersection C3 which is one of the course change points shown in FIG. In this figure, it is assumed that there is another vehicle VB that turns right at the intersection C3 in the same direction in front of the specific vehicle VA in the traveling direction. In addition, the vehicle VB is also connected to the center device 15.
0, and the vehicle ID is "UY58" as shown in FIG. The feature of the other vehicle VB is “black sedan”, and the route is “R02, R03, R04,.
02, C03, …… ”. That is, before and after the intersection C3, the vehicle travels on the same route as the route of the specific vehicle shown in FIG.

On the center side, the movement of the other vehicle VB is grasped, and the corresponding other vehicle guidance data is stored in the specific vehicle VA.
Send to For the specific vehicle VA, "The next intersection is to the right. The black sedan turns right ahead in the direction of travel.
The distance between the vehicle and the intersection is 30 meters. Is provided by voice. Therefore, the specific vehicle VA only needs to turn at the intersection C3 following the other vehicle VB ahead, and the inconvenience such as accidentally turning right at the intersection C2 before the intersection C3 is prevented.

As described above, according to the present embodiment, the progress data of another approaching vehicle in the peripheral area around the intersection is transmitted from the center side to the moving side. Therefore, data of other vehicles entering the intersection can be obtained without providing a beacon or the like at the intersection. The driver can use the guidance data on the other vehicles to accurately pass through an intersection or change course.

The present invention has many embodiments, and various modifications can be made based on the above disclosure. For example, the following is also included. In the case where the vehicle goes straight ahead at the intersection, there is no inconvenience even if there is no guidance regarding other vehicles. Therefore, the guidance data of other vehicles may be transmitted from the center side to the moving side only at the course change point, that is, at the intersection where the specific vehicle changes the course, among the intersections present on the searched route. In the example of FIG. 6, intersections C3 and C6 correspond to the course change points.

In the above embodiment, the data of the other vehicle traveling in the same direction as the specific vehicle (such as going straight or turning left or right) is transmitted from the center side to the moving side. , The guidance data may be transmitted. For example, at an intersection where there is no traffic light and visibility is poor, it is convenient to notify a specific vehicle in advance that there is another vehicle approaching the intersection to call attention.

In the above embodiment, the guidance of the other vehicle is provided by voice, but the own vehicle and the other vehicle may be displayed on the display screen. In this case, it is easy to understand if the display corresponds to the color and type of the vehicle. The road data, the intersection data, and the area guidance data shown in the above-described embodiment are merely examples, and may be changed as needed. In addition, the format of the data may be appropriately changed in the same manner. Although the above-described embodiment is an application of the present invention to a vehicle, it is applicable to various moving objects such as a portable mobile terminal.

[0051]

As described above, according to the present invention,
The center manages the route data of each vehicle, grasps the position of each vehicle at the intersection and its surroundings, and provides guidance data on the progress of other vehicles to specific vehicles. This makes it possible to obtain the progress of another vehicle, and to perform an appropriate traveling process such as turning right or left at an intersection.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of data stored in a database of FIG. 1;

FIG. 3 is a diagram showing an example of voice guidance data corresponding to a situation of another vehicle.

FIG. 4 is a flowchart showing operations of route search and guidance data extraction.

FIG. 5 is a diagram showing an example of a schematic view of a searched route.

FIG. 6 is a diagram illustrating an example of a searched route.

FIG. 7 is a diagram illustrating an example of searched route data.

FIG. 8 is a diagram illustrating an example of guidance data of a searched route.

FIG. 9 is a diagram showing a state of a vehicle and various corresponding data.

FIG. 10 is a flowchart showing an operation of specifying guidance data of another vehicle in the center device.

FIG. 11 is a flowchart illustrating an operation of guiding another vehicle in a specific vehicle.

FIG. 12 is a diagram showing an example of a vehicle arrangement on a search route.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 vehicle-mounted navigation device 101 arithmetic processing unit 102 system control unit 102 program storage unit 103 data storage unit 104 position measurement unit 105 input unit 106 display unit 107 voice output unit 108 transmission / reception unit 150 center Device 150 Result center device 151 Communication control unit 152 System control unit 153 Database C1-C8 Intersection L ... Distance M ... Position PA ... Destination PD ... Departure point R1-R9 ... Road VA ... Specific vehicle VB ... Other vehicle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Sugawara 2--19-12 Sotokanda, Chiyoda-ku, Tokyo Inside Equos Research Co., Ltd. (72) Inventor Satoshi Kitano 2--19 Sotokanda, Chiyoda-ku, Tokyo No. 12 F-term in Equos Research Co., Ltd. (reference) 2F029 AA02 AB01 AB07 AB09 AB13 AC02 AC04 AC08 AC09 AC14 AC18 AD02 5H180 AA01 BB05 DD02 FF04 FF05 FF10 FF12 FF13 FF25 FF27 FF32 FF33 FF38

Claims (5)

[Claims] 1. Data storage means storing data for route search, route guidance, and other vehicle guidance; route search means for performing a route search using the data in the data storage means; Guidance data obtaining means for obtaining guidance data on a set route from the data storage means; other vehicle data obtaining means for obtaining guidance data of another vehicle at an intersection and its surroundings from the data storage means; route data obtained by the route searching means A transmission unit for transmitting the guidance data obtained by the guidance data acquisition unit and the other vehicle data acquisition unit to a mobile side. 2. The navigation center device according to claim 1, wherein the other vehicle data acquiring means acquires guidance data for another vehicle traveling in the same direction as the specific vehicle to be guided. 3. A data receiving means for receiving route data and guidance data transmitted from the navigation center device according to claim 1 or 2; a data storing means for storing each data received thereby; a position for measuring a current position A navigation device comprising: a measuring means; data corresponding to a measurement result thereby read out from the data storage means, and a route guidance means for performing a route guidance based on the read data. 4. A navigation system comprising the navigation center device according to claim 1 or 2 and the navigation device according to claim 3. 5. A step of searching for a route on the center side; a step of extracting guidance data on the searched route; a step of extracting guidance data of another vehicle at an intersection and its surroundings; Transmitting to the specific vehicle side; and performing a route guidance on the specific vehicle side based on the transmitted data.