JP4959951B2 - Mobile phone - Google Patents

Description

  The present invention relates to a mobile phone, and more particularly to a method for displaying a direction.

As part of a navigation system using a mobile phone, there is a mobile phone that uses GPS (Global Positioning System) to indicate position information and an azimuth sensor to indicate an azimuth.
As a mobile phone equipped with an orientation sensor, there is one disclosed in Patent Document 1.
Japanese Patent Laid-Open No. 2004-23511

  By the way, the direction sensor reads the direction of geomagnetism and indicates the direction, and more precisely indicates the direction of magnetism obtained by combining the geomagnetism and the magnetism around the direction sensor. The mobile phone is equipped with various magnetic parts such as speakers and open / close detection magnets, and a considerable amount of current may flow on the mobile phone substrate. Control must be performed for the sensor to point to the correct orientation. However, this control is very complicated.

  Therefore, an object of the present invention is to provide a mobile phone that can display the traveling direction of a user who is moving with the mobile phone to some extent without using a direction sensor.

  In order to solve the above problems, a mobile phone according to the present invention is based on position information acquisition means for sequentially acquiring position information of its own device, map information acquisition means for acquiring map information including road information, and the map information. The direction of travel based on the specifying means for specifying the road, the extending direction of the road specified by the specifying means, the position information acquired last by the position information acquiring means, and the position information acquired before that And a display means for displaying the map based on the map information and the traveling direction estimated by the estimation means in association with each other.

  Here, displaying in association means displaying the map information so that the upper end of the display screen is the traveling direction and is included in the point screen indicated by the position information acquired last. It also includes displaying the map information so that the upper end of the screen always coincides with the north of the map, and the point indicated by the position information acquired last is included in the screen. It is assumed that the user views the screen of the mobile phone according to the way the maker intends to hold the screen.

  Here, the traveling direction means the traveling direction of the user who is moving with the mobile phone.

  With the configuration as described above, the mobile phone according to the present invention can estimate the user's traveling direction from the direction in which the road extends and the position information of two points, and display the traveling direction corresponding to the map. Can do. By providing the above configuration, the direction can be displayed to some extent without an orientation sensor. Since the direction sensor is not mounted, the installation space on the board can be made as much as that, and the cost reduction effect can be obtained by not mounting the direction sensor.

  The present invention is based on the assumption that the user normally uses the navigation system when walking on the road toward the destination, and the user is moving on the road toward the destination. It is made based on the assumption. Originally, a road has at least one direction, and as long as the user walks on the road, a prediction is made that the user is traveling toward one of the directions of the road. Depending on the direction of the road, the traveling direction of a user who is moving with a mobile phone can be limited to some extent, and further, at least two points of continuous location information can be obtained to correspond to the direction obtained. The direction in which the user is traveling can be estimated.

The mobile phone may further include map information storage means for storing the map information, and the map information acquisition means may acquire the map information from the map information storage means.
Thereby, when the mobile phone has a sufficient storage capacity and stores map information, the map information can be used.

The mobile phone further includes communication means for communicating data with an external device, and server information storage means for storing information for specifying an external server storing map information. The information acquisition means may acquire the map information from the external server by the communication means.
Thereby, map information can be acquired from the external server which has memorized map information via a network, and the map information can be used. Since the storage capacity of the mobile phone is limited, it is desirable to download map information and the like having an enormous amount of data when displaying the map information.

  The cellular phone further includes a partial map information storage means for storing a part of the map information, a communication means for communicating data with an external device, and an external server for storing the map information. Server information storage means for storing information to be specified, wherein the map information acquisition means communicates when the map of the location information acquired by the acquisition means is not stored in the partial map information storage means The map information may be acquired by means.

Thus, when the mobile phone stores map information only in an area where the mobile phone is located (for example, the user's living area), the map information stored in the mobile phone is used when performing navigation in the user's living area. When the navigation is performed outside the user's life zone, the map information can be downloaded from an external server and used.
The mobile phone may have a GPS function, and the position information acquisition unit may acquire position information using the GPS function.

Thereby, the position information of the mobile phone can be acquired by using the GPS. GPS is a method of calculating position information based on the data by communication with three GPS satellites, and the mobile phone further uses communication data with the base station.
The specifying unit may specify a road closest to the position information acquired last by the position information acquiring unit.

Thereby, the road closest to the position information acquired by the mobile phone can be specified.
The specifying unit may specify a road whose distance from the position information acquired last by the position information acquiring unit is within a predetermined range.
Thereby, one or more roads close to the position information acquired by the mobile phone can be specified. Since the road closest to the position information of the own device is not necessarily on the road where the user having the own device is present, a plurality of roads can be specified by this method.

Further, the map information includes information indicating a road with a plurality of points and a line segment formed by the connection of the points, and the specifying means includes the position information acquired last by the position information acquiring means, It is good also as specifying the road with the shortest distance to the line segment formed by two points among points close to position information.
As a result, the road can be represented by a line segment formed by a point where the road becomes a node such as an intersection and a connection between the points, and a road that is a line segment close to the acquired position information can be specified.

The mobile phone may further include a receiving unit that receives a user input, and the specifying unit may specify a road specified by the user input.
Thereby, when the road on which the user is walking is known, it is possible to omit the process of specifying the road of the mobile phone by designating the road by key input. Further, when the acquired position information is not accurate, it can be corrected.

The display means may display the map such that the upper end of the display screen is the traveling direction, and the position information position acquired last by the position information acquisition means is included in the screen.
Accordingly, the upper end of the screen of the mobile phone can be displayed by rotating and scrolling the map as the user's traveling direction.

The display means may display a map so that the position information position acquired last by the position information acquisition means is included in the screen, and display the traveling direction with a specific symbol.
Thereby, the upper end of the screen of the mobile phone always displays one direction (for example, north), and the traveling direction of the user who has the mobile phone when using a display method that only scrolls without rotating the map, for example, an arrow or the like Can be expressed as

  In addition, a method of displaying a traveling direction, a position information acquisition step of sequentially acquiring position information of the own aircraft, a map information acquisition step of acquiring map information indicating a road, and a road is identified based on the map information A step of inferring the traveling direction based on the extending direction of the road specified by the specifying means, the position information acquired last and the position information acquired before, and the map information A display step of displaying the traveling direction estimated by the estimating means in correspondence with each other.

  A direction display program for displaying a traveling direction on a computer, based on the map information, a position information acquisition step for sequentially acquiring position information of the own device, a map information acquisition step for acquiring map information indicating a road, and the map information An identifying step for identifying a road, an extending direction of the road identified by the identifying means, a estimating step for estimating a traveling direction based on the position information acquired last and the position information acquired before, It may include a display step of displaying the map information and the traveling direction estimated by the estimating means in association with each other.

With this method or program, the mobile phone can display the traveling direction of the user who is moving with the mobile phone.
Further, position information acquisition means for sequentially acquiring the position information of the own device, map information acquisition means for acquiring map information indicating a road, specification means for specifying a road based on the map information, and specification by the specification means An extension direction of the generated road, a guessing means for estimating a travel direction based on the position information acquired last and the position information acquired before, and the travel direction estimated by the map information and the guess means It is good also as providing the display means to display correspondingly.

  Thereby, the traveling direction of the user who is moving with the mobile terminal can be displayed without using the direction sensor even in the mobile terminal that performs navigation other than the mobile phone.

Hereinafter, a mobile phone according to an embodiment of the present invention will be described with reference to the drawings.
<Configuration>
FIG. 1 is a system diagram showing a configuration of a system including a mobile phone 100.
The mobile phone 100 communicates with the GPS satellite group 110 and the base station 120 and transmits the data to the position calculation server 140 via the network 130. The position calculation server 140 calculates the longitude and latitude of the mobile phone 100 using the acquired data, and returns the information to the mobile phone 100. The cellular phone 100 transmits the acquired longitude and latitude information to the map information holding server 150, and the map information holding server 150 returns the map information around the longitude and latitude to the cellular phone 100. Based on the map information and the longitude and latitude information acquired sequentially, the traveling direction of the own device is estimated, and the mobile phone 100 displays the traveling direction, the map, and the position information so as to correspond to each other.

FIG. 2 is a functional block diagram of the mobile phone 100.
The mobile phone 100 includes a communication unit 201, an antenna 202, an audio unit 203, a microphone 204, a speaker 205, a GPS communication unit 206, an antenna 207, a display unit 208, an operation unit 209, and a control unit 210. It is comprised including.
The communication unit 201 has a function of demodulating the reception signal received from the antenna 202 into a reception voice signal and a reception data signal, and outputting the demodulated reception voice signal to the voice unit 203 and the reception data signal to the control unit 210. In addition, it also has a function of modulating the A / D converted transmission voice signal from the voice unit 203 and a transmission data signal such as an electronic mail given from the control unit 210 and outputting the modulated data signal via the antenna 202.

The voice unit 203 D / A converts the received voice signal output from the communication unit 201 and outputs the signal to the speaker 205, and A / D converts the transmission voice signal acquired from the microphone 204 to communicate the generated signal. A function of outputting to the unit 201.
The GPS communication unit 206 has a function of communicating with the GPS satellite group 110 via the antenna 207, acquiring the position information of the mobile phone 100, and a function of outputting the acquired position information to the control unit 210. Note that the antenna 202 and the antenna 207 may be shared. The acquired position information is represented by longitude and latitude.

The display unit 208 includes an LCD (Liquid Crystal Display) and a backlight, and displays an image according to an instruction from the control unit 210.
The operation unit 209 includes a numeric keypad, an on-hook key, an off-hook key, a cursor key, and the like. The operation unit 209 is used for dial operation, call start operation, call end operation, navigation start end operation, and the like. A function of outputting the input content to the control unit 210 is provided.

The control unit 210 has a function of controlling each unit included in the mobile phone 100 and includes a CPU (Central Processing Unit) 220, a ROM (Read Only Memory) 230, and a RAM (Random Access Memory) 240. The The ROM 230 has a function of storing various programs for controlling the mobile phone 100, and particularly has a function of storing a navigation program 231. The RAM 240 has a function of storing various data such as a phone book used in the mobile phone 100, and in particular, a function of storing the position information 241 of the own device during navigation and the map information 242 downloaded from the map information holding server 150. Have. The CPU 220 has a function of reading various programs in the ROM 230 and writing data in the RAM 240 and controlling the mobile phone 100 while using data in the RAM 240.
<Data>
Next, data related to the mobile phone 100, particularly data related to navigation will be described with reference to the drawings.

FIG. 3A is an example of a map downloaded by the mobile phone 100 from the map information holding server 150. A part of such a map is displayed on the display unit 240 of the mobile phone 100.
FIG. 4 is a node table 400 that holds nodes that are road nodes, their position information, and link destination node information. The node table 400 includes a node number 401, longitude and latitude information 402, and a link destination node number 403.

The node number 401 represents a road-to-road intersection or a road node.
The longitude / latitude information 402 represents the position information of each node of the node number 401.
The link destination node number 403 indicates that the node is connected to any other node, thereby forming a road.
In FIG. 4, for example, the longitude and latitude information of the node number 00301 is longitude 133.3137623 and latitude 34.4180754, and the link destination node numbers include nodes 00300, 00302, and 30388. When this road information is converted into an image like a map, it is as shown by the solid line in FIG.

FIG. 6 is a diagram showing an example of a map screen displayed on the display screen of the mobile phone 100 during the navigation process.
<Operation>
Next, the navigation operation of the mobile phone 100 according to the present invention will be described with reference to the flowcharts shown in FIGS.

  First, the GPS communication unit 206 communicates with the GPS satellite group 110, the communication unit 201 communicates with the base station 120, transmits the data to the position calculation server 140, and the position calculation server 140 uses the data as position information. The mobile phone 100 acquires the position information of its own device by the procedure of calculating and returning it to the mobile phone 100 (step S701). Hereinafter, when the mobile phone 100 acquires position information, the above procedure is performed.

  The acquired position information is stored in the RAM 240 (step S703), and the position information is transmitted to the map information holding server 150. The map information holding server 150 sends back the map information around the position information acquired from the mobile phone 100 to the mobile phone 100, and the mobile phone 100 acquires the map information via the antenna 202 (step S705). The acquired map information is stored in the RAM 240.

The position information is acquired again (step S707), and the position information is stored in the RAM 240 (step S709). A road on which the user, that is, the mobile phone is supposed to exist is specified from the position information, that is, the position information acquired last by the mobile phone 100 (step S711). A road identification method will be described later with reference to the flowchart of FIG.
Then, the traveling direction of the user who owns the mobile phone 100 is estimated from the two directions of the direction formed from the position information acquired last and the position information acquired before and the direction in which the specified road extends. (Step S713). In the estimation method, the first point is a point where a perpendicular line dropped on the road identified from the position information point acquired immediately before the last acquired position information. And the point where the perpendicular drawn down to the road specified from the point of the position information acquired at the end crosses is made into the 2nd point. And the direction which goes straight from a 1st point to a 2nd point is estimated as a advancing direction. When the road specified by the position information acquired last and the road specified by the position information acquired before are different roads, the intersection of the two roads is linearly extended from the second point to the second point. Guess the direction to go as the direction of travel.

  And the intersection of the perpendicular line down to the specified road from the last acquired position information and the specified road is in the center of the screen, and the estimated traveling direction is from the bottom edge of the screen to the top edge A map is displayed on the display unit 208 (step S715). Then, the process returns to step S707, and the position information is acquired again (step S707), and this is repeated thereafter. Although not shown here, if the user who is moving with the mobile phone 100 goes out of the range of the acquired map information, the surrounding map information is newly downloaded, The map information that has been downloaded and stored in the RAM 240 is deleted.

The operation ends when the user performs an operation to end the navigation program via the operation unit 209.
Next, the road specifying method in step S711 in FIG. 7 will be described using the flowchart in FIG.
First, based on the acquired position information, a node having a longitude and latitude close to the longitude and latitude is searched from the node table 400 (step S801). The link destination of the searched node is searched by the link destination node number, and the line segment having the closest distance from the position information to the line segment formed between the two points is searched (step S803). At this time, it is assumed that a vertical line drawn down from the line information retrieved from the position information intersects. In addition, if there is information on the road specified last time, the road and a road connected to the road may be preferentially searched. This can greatly reduce the road search time.

  Then, it is determined whether or not the searched road is the same as or connected to the previously searched road (step S805). This increases the certainty of road search by including this process under the assumption that the human being does not move at high speed. If the road searched here is the same as or connected to the road searched last time (step S805: YES), the searched road is determined as the road where the user is located (step S809), and the road identification process is performed. Exit. If they are the same or not connected (step S805: NO), it is determined that the searched road is a road without a user, another road is searched (step S807), and the process returns to step S805. Take the steps.

From here, a specific example of the flow until the direction is presented in the navigation of the mobile phone 100 will be described with reference to the flowcharts of FIGS. Here, an example of a scene in the middle of navigation is shown, and it is assumed that the map information has already been downloaded to the mobile phone.
First, the cellular phone 100 acquires the longitude / latitude information (135.3137789, 34.3180700) via the GPS communication unit 206, assuming that the mobile phone 100 was at the position 502 in FIG. 5A (step S707). The acquired longitude / latitude information (135.3178991, 34.3180700) is stored in the RAM 240 (step S709). Then, the road where the user is supposed to be is specified from the longitude and latitude information (step S711).

  A node close to the point is searched from the longitude and latitude information acquired when specifying the road (step S801). Here, nodes 00301, 00302, 00303, etc. are searched as nodes close to the longitude and latitude information of the point 502. A line segment formed from the link destination node numbers of these nodes is used as a road, and a distance of a perpendicular line drawn from the point 502 to the line segment, that is, a distance close to the road from the point 502 is searched (step S803). . Here, it is assumed that the perpendicular line drawn from the point 502 intersects the line segment formed by the nodes. Here, it is assumed that the user who owns the mobile phone 100 is on a line segment (road) formed by the nodes 00301 and 00302.

  Here, it is determined whether the road estimated this time is the same as the road specified by the position information acquired last time, or whether the previous road and the current road are connected. Here, the previously acquired position information is the longitude and latitude information (135.3137543, 34.4180736) of the point 501, and the line segment (road) formed by the nodes 00301 and 00302 based on the information is the road where the user is Suppose that it was specified. Since the road identified last time is the same as the road searched this time (step S805: YES), the mobile phone 100 has a line segment (road) formed by the node 00301 and the node 00302 when the user owns the mobile phone 100. It is determined that the user is at the top (step S809).

And the direction of the arrow 510 shown in FIG. 5B from the point 503 where the perpendicular dropped from the point 501 to the previously specified road to the point 504 where the perpendicular dropped from the point 502 to the currently specified road intersects, It is estimated that the traveling direction of the user who owns and moves is own (step S811).
A map is displayed as shown in FIG. 6 so that the point 504 is at the center of the screen and the estimated traveling direction is at the upper end of the screen of the display unit 208 of the mobile phone 100 (step S715).
<Supplement>
Although the mobile phone according to the present invention has been described based on the above-described embodiment, it goes without saying that the embodiment according to the present invention is not limited to this. Hereinafter, the modified example will be described.
(1) In the above embodiment, the map information is downloaded from the map information holding server 150 because the ROM 230 and the RAM 240 mounted on the mobile phone 100 have a limited storage capacity. If the ROM 230 or the RAM 240 has a sufficient storage capacity, it may be stored in advance. Alternatively, a method may be used in which some map information, for example, a region where the user lives is stored in advance, and downloaded when navigation is performed in other regions. If the map information is stored in advance, the process of downloading the map information from the map information holding server 150 can be omitted, and the communication cost can be reduced.
(2) In the above embodiment, the map is displayed so that the upper end of the screen of the mobile phone 100 is always in the estimated traveling direction. However, the map does not rotate but only scrolls. When displayed to be north, the traveling direction may be expressed using a symbol such as an arrow. Alternatively, instead of an arrow, the node table 400 further has information on the name of the road, and the traveling direction may be written in characters such as “National road 3 is going south and south” or may be output by voice.
(3) In the above embodiment, in order to infer the traveling direction of the user who is moving with the mobile phone 100, the obtained position information points are mixed with the perpendicular line drawn on the road which seems to be the closest. The direction is determined from the point at which the perpendicular point drawn on the closest road intersects with the point obtained before and the position information acquired before that, but the method of estimating the traveling direction is not limited to this. For example, a method of adapting the vector formed by the position information of two points to the direction of the road is also conceivable. Cases are intended to be included in the present invention.
(4) In the above-described embodiment, the road is a line segment formed by connecting the points that become the milestones of the road. However, any information can be used as long as the mobile phone can be identified as a road. A method of identifying a road by analyzing a picture of information may be used.
(5) In the above embodiment, steps S805 and S807 in the flowchart of FIG.
(6) In the above embodiment, a method may be used in which a road within a certain distance in which the distance from the acquired position information to the road is set by the creator of the mobile phone is specified. Thereby, the number of roads from which a plurality of roads may be selected can be reduced.
(7) In the above embodiment, the direction is estimated from the position information acquired last and the position information acquired immediately before, but the direction is estimated not only from the previous time but also from a plurality of position information acquired before that. It is good to do. This can increase the accuracy in estimating the traveling direction.
(8) In the above embodiment, the road is specified based on the position information acquired when the road is specified. However, the road may be specified by the user's designation via the operation unit 209. By using this method when the user knows the road through which the user originally passes, it is possible to reduce the road identification burden on the mobile phone. If the road specified by the acquired position information is incorrect, the road may be designated and corrected by user input.

  The mobile phone according to the present invention can be used as a mobile phone capable of navigation.

1 is a system diagram including a mobile phone 100. FIG. 2 is a functional block diagram of a mobile phone 100. FIG. FIG. 3A shows a part of a map that the mobile phone 100 acquires from the map information holding server 150. FIG.3 (b) is explanatory drawing which showed the road information in the map of Fig.3 (a). It is a node table 400 showing road information by the number of a node that is a contact point of the road, its longitude and latitude, and the link destination node number. It is explanatory drawing for demonstrating estimating a direction from the positional information on the acquired two points. It is the figure which showed the screen displayed on a mobile telephone during navigation. It is the flowchart which showed the operation | movement in the navigation of a mobile telephone. It is the flowchart which showed the method of specifying a road from position information.

Explanation of symbols

100 cellular phone 110 GPS satellite group 120 base station 130 network 140 position calculation server 150 map information holding server 201 communication unit 202, 207 antenna 203 audio unit 204 microphone 205 speaker 206 GPS communication unit 208 display unit 209 operation unit 210 control unit 220 CPU
230 ROM
231 Navigation program 240 RAM
241 Position information 242 Map information 400 Node table 401 Node number 402 Longitude / latitude information 403 Link destination node number

Claims (13)

Position information acquisition means for sequentially acquiring the position information of the own machine;
Map information acquisition means for acquiring map information including road information;
A specifying means for specifying a road based on the map information;
An estimation means for estimating a traveling direction based on the extension direction of the road specified by the specifying means, the position information acquired last by the position information acquiring means, and the position information acquired before;
Display means for displaying the map based on the map information and the traveling direction estimated by the estimation means in association with each other;
The map information includes information indicating a road with a line formed by a plurality of points and a connection of the points,
The specifying unit searches for a road having the closest distance from the position information acquired by the position information acquiring unit lastly and a line segment formed by two of the points close to the position information. The road is specified based on whether the searched road matches the road specified based on the previously acquired position information or whether the road is connected. Phone. The mobile phone further includes:
Comprising map information storage means for storing the map information;
The mobile phone according to claim 1, wherein the map information acquisition unit acquires the map information from the map information storage unit. The mobile phone further includes:
A communication means for communicating data with an external device;
Server information storage means for storing information for identifying an external server storing map information;
The mobile phone according to claim 1, wherein the map information acquisition unit acquires the map information from the external server by the communication unit. The mobile phone further includes:
Partial map information storage means for storing a part of the map information;
A communication means for communicating data with an external device;
Server information storage means for storing information for identifying an external server storing map information;
The map information acquisition means acquires the map information by the communication means when the partial map information storage means does not store a map around the position information acquired by the position information acquisition means. Item 2. The mobile phone according to Item 1. The mobile phone has a GPS function,
The mobile phone according to claim 1, wherein the position information acquisition unit acquires position information using the GPS function. The mobile phone according to claim 1, wherein the specifying means specifies a road closest to the position information acquired last by the position information acquiring means. The mobile phone according to claim 1, wherein the specifying means specifies a road whose distance from the position information last acquired by the position information acquiring means is within a predetermined range. The mobile phone further includes:
A reception means for receiving user input;
The mobile phone according to claim 1, wherein the specifying unit specifies a road specified by the user input. The display means displays a map such that the upper end of the display screen is a traveling direction and the location of the position information acquired last by the position information acquisition means is included in the screen. The mobile phone described. The display means displays a map so that a point of the position information acquired last by the position information acquisition means is included in a screen, and displays the traveling direction with a specific symbol. The mobile phone described. A method of displaying a direction of travel,
A position information acquisition step for sequentially acquiring the position information of the own machine;
A map information acquisition step for acquiring map information indicating a road;
A specifying step of specifying a road based on the map information;
An estimation step of estimating the traveling direction based on the extension direction of the road specified by the specifying means, the position information acquired last and the position information acquired before;
A display step of displaying the map information and the traveling direction estimated by the estimating means in correspondence with each other,
The map information includes information indicating a road with a line formed by a plurality of points and a connection of the points,
The specifying step searches for the road having the shortest distance from the position information to the line formed by the position information acquired last by the position information acquiring step and a line segment formed by two points close to the position information. The road is identified based on whether or not the searched road and the road identified based on the previously acquired position information match or are connected. Display method. A direction display program for displaying a direction of travel on a computer,
A position information acquisition step for sequentially acquiring the position information of the own machine;
A map information acquisition step for acquiring map information indicating a road;
A specifying step of specifying a road based on the map information;
An estimation step of estimating the traveling direction based on the extension direction of the road specified by the specifying step, the position information acquired last and the position information acquired before;
A display step of displaying the map information and the traveling direction estimated by the estimating means in correspondence with each other,
The map information includes information indicating a road with a line formed by a plurality of points and a connection of the points,
The specifying step searches for the road having the shortest distance from the position information to the line formed by the position information acquired last by the position information acquiring step and a line segment formed by two points close to the position information. The road is identified based on whether or not the searched road and the road identified based on the previously acquired position information match or are connected. Display program. Position information acquisition means for sequentially acquiring the position information of the own machine;
Map information acquisition means for acquiring map information indicating a road;
A specifying means for specifying a road based on the map information;
An estimation means for estimating the traveling direction based on the extension direction of the road specified by the specifying means, the position information acquired last and the position information acquired before;
Display means for displaying the map information in correspondence with the traveling direction estimated by the estimation means;
The map information includes information indicating a road with a line formed by a plurality of points and a connection of the points,
The specifying unit searches for a road having the closest distance from the position information acquired by the position information acquiring unit lastly and a line segment formed by two of the points close to the position information. The road is specified based on whether the searched road matches the road specified based on the previously acquired position information or whether the road is connected. Terminal.

Images