JP2004294102A - Route guidance apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a route guidance apparatus capable of easily specifying a guidance intersection without overlooking it. <P>SOLUTION: A present location detecting means 102 in the route guidance apparatus 100 detects a present location of the route guidance apparatus 100. A difficulty determining means 106 determines specific difficulty on the guidance intersection through the use of a guidance information data reference means 104. A guidance information display means 110 displays guidance information on a display intersection determined by a display intersection determining means 108 on a display screen 112. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a route guidance device that guides a route by performing a display for guiding a guidance intersection near a guidance intersection where a course change is to be performed.
[0002]
[Prior art]
Conventionally, a route guidance device (hereinafter, referred to as a first device) that displays a mark (for example, a building or the like) near the guidance intersection is known in the vicinity of the guidance intersection (Patent Document 1).
According to the first device, the guided person can search for the guidance intersection based on the display content.
In addition, a route guidance device (hereinafter, referred to as a second device) that displays both a mark at the guidance intersection and an intersection in front of the guidance intersection near the guidance intersection is known.
According to the second device, the guided person can start searching for the guidance intersection from the intersection in front thereof based on the display content.
[0003]
[Patent Document 1]
JP 2000-205880 A
[0004]
[Problems to be solved by the invention]
In general, it is desirable that the display by the route guidance device is a content that can be easily searched without overlooking the guidance intersection.
[0005]
However, in the first device, when there is no mark at the guidance intersection, the guidance intersection is overlooked.
[0006]
In addition, in the second device, since both the mark at the guidance intersection and the intersection in front of the guidance intersection are displayed, the display is complicated, the contents cannot be instantly understood, and as a result, the guidance intersection is overlooked. May be lost.
[0007]
The present invention has been made in view of such a problem, and an object of the present invention is to provide a route guidance device that allows a guided person to easily specify a guidance intersection.
[0008]
[Means for Solving the Problems and Their Functions and Effects]
The present invention for solving at least a part of the above-described problems is a route guidance device that provides a display for guiding a guidance intersection at which a course change should be performed when guiding a predetermined route,
A route information acquisition unit that acquires route information that specifies the predetermined route;
Guidance information data reference means for referring to guidance information data in which the intersection existing on the route and the guidance information are associated with each other;
Difficulty determining means for determining the difficulty when the guided person specifies the guidance intersection based on a predetermined rule,
A display intersection determining means for determining a display intersection as an intersection displayed in a guidance image displayed including the guidance information in order to guide the guidance intersection, in accordance with a determination result of the difficulty determination means;
Guidance information display means for displaying guidance information corresponding to the display intersection determined by the display intersection determination means, using the guidance information data reference means;
It is characterized by having.
[0009]
The moving object to be guided in the present invention corresponds to an object moving on a road, for example, a vehicle such as an automobile or a bicycle, a pedestrian, and the like. Devices such as mobile phones and PDAs carried by pedestrians are also included. The guided person corresponds to a driver of a vehicle or the like, a pedestrian, a device holder, or the like.
[0010]
The guidance information refers to various types of information relating to a mark for the guided person to specify the position of the intersection or the intersection. The various types of information on the landmarks include the shape and name of the intersection, buildings near the intersection, and signs.
[0011]
The specific difficulty of the guidance intersection means the difficulty of identifying the guidance intersection. Generally, when there is no building or sign near the guidance intersection or when there is an intersection with a similar shape or name near the guidance intersection, it is difficult to specify the guidance intersection. Conversely, when there is a building or a sign near the guidance intersection, or when there is no intersection having a similar shape or name near the guidance intersection, it is not difficult to specify the guidance intersection.
[0012]
In the route guidance device according to the present invention, the guidance information data reference unit refers to the guidance information data in which the intersection existing on the route is associated with the guidance information. The guidance information data to be referred to may be configured integrally with the present route guidance device or may be configured separately. When they are configured separately, it is possible to adopt a configuration in which both are connected via a network. The network is typically the Internet, but is not limited to the Internet, and may be a limited network such as a LAN (Local Area Network) or a dedicated line network. The network can adopt a configuration in which communication is performed by wire or wirelessly.
[0013]
The difficulty determination means determines a specific difficulty of the guidance intersection according to a predetermined rule. Difficulty to judge is not limited to bipolar judgment such as "difficult" / "not difficult", and may include an intermediate judgment such as "somewhat difficult". May be used. The rules used for the determination include, for example, a rule based on the presence of a landmark near the guidance intersection, the number of guided persons who feel that it is difficult to identify the guidance intersection, and a traffic record that has accidentally passed the guidance intersection. A rule based on statistical data, a rule based on road attributes such as a lane width and a road type of a road intersecting at a guidance intersection can be applied.
[0014]
The display intersection determining means determines a display intersection as an intersection to be displayed for guiding the guidance intersection, according to the determination result of the difficulty determining means. For example, when it is determined that the specification of the guidance intersection is “not difficult”, only the guidance intersection is determined as the display intersection. If it is determined that the guidance intersection is difficult to specify, not only the guidance intersection but also the intersection near the guidance intersection, such as the intersection before the guidance intersection, is determined as the display intersection. The displayed intersection is not limited to the intersection on the route. For example, when an intersection where a landmark that can be visually recognized from a distance exists is near the guidance intersection, or when the intersection is off the route, the intersection may be treated as a display intersection. Except for the guidance intersection, only nearby intersections may be displayed intersections. When the difficulty is represented by an index value, the number of display intersections other than the guidance intersection may be changed according to the index value.
[0015]
The guidance information display means displays guidance information corresponding to the display intersection determined by the display intersection determination means using the guidance information data reference means. For example, when a guidance intersection and an intersection in front of the guidance intersection are determined as display intersections, display is performed based on the guidance information associated with each. When only the guidance intersection is determined as the display intersection, the display is performed based only on the guidance information associated with the guidance intersection.
[0016]
As described above, according to the route guidance device of the present invention, the display content is changed based on the difficulty of specifying the guidance intersection, so that the guidance intersection is easily specified without making the display uselessly complicated. It becomes possible.
[0017]
In the present invention, guidance information data reference means may be used to determine difficulty. For example, when the guidance information includes information about a mark at an intersection, difficulty can be determined based on the information about the mark. The judgment can be made in various ways. For example, when the information on the guide intersection at the mark is equal to or less than a predetermined number, it may be determined that it is difficult to specify the guide intersection.
[0018]
Further, the visibility of the mark itself may be evaluated using an index. As an example of the latter, when a department store or a general store is treated as a mark, a method of giving a high evaluation value “10” to a department store and a low evaluation value “1” to a general store in consideration of the visibility is given. . If the sum of the evaluation values of the landmarks around each intersection is used as the evaluation value of the intersection, the difficulty can be quantitatively evaluated in consideration of the visibility of each landmark. The evaluation value for the mark may be set according to the attribute of a feature such as a department store or a general store, or may be individually set for each feature. In the latter example, for example, even in an area where department stores stand at each intersection, such as a downtown area, and department stores cannot always be useful landmarks, an appropriate evaluation value reflecting such circumstances is set. It becomes possible.
[0019]
If the information on the mark is equal to or less than a predetermined value, it may be determined that the mark is difficult. The value equal to or less than the predetermined value means that the effective information as a mark is equal to or less than a certain amount. Therefore, for example, when there is no information about the mark, or when it is determined that the validity of the mark is low even if there is a lot of information about the mark, it corresponds to a predetermined value or less. On the other hand, if it is determined that the validity of the mark is high even if the information on the mark is small, it does not fall below the predetermined value.
[0020]
In the present invention, when it is determined that it is difficult to specify the guidance intersection, it is preferable to determine that the intersection before the guidance intersection is included in the display intersection. In this case, a guidance intersection may be included, or information on the intersection in front may be displayed instead of the guidance intersection.
[0021]
Furthermore, in the route guidance device of the present invention, the display intersection may be determined for an intersection within a predetermined distance from the guidance intersection. This predetermined distance means that the physical distance between the guidance intersection and the intersection in front of the guidance intersection is more than a predetermined distance. The distance may be a straight-line distance or a distance.
[0022]
In general, it is not difficult to identify the guidance intersection when the guidance intersection is separated from the intersection before it, as compared to when the guidance intersection and the intersection before it are close. In some cases, it is difficult to find the guidance intersection (for example, the display scale is reduced). According to this route guidance device, when the guidance intersection and the intersection before the guidance intersection are separated by a predetermined value or more, the guidance intersection is excluded from the display intersection, so that the guidance intersection can be easily specified.
[0023]
The present invention can be configured in various aspects, in addition to the aspect as the route guidance device described above. For example, the present invention may be configured as a route guidance method for performing a display for guiding a guidance intersection when a moving body moving according to a predetermined route approaches a guidance intersection to be guided using a computer. Further, the present invention may be configured as a computer program for causing a computer to realize the route guidance function, and a recording medium on which the computer program is recorded.
[0024]
Here, examples of the recording medium include a flexible disk, a CD-ROM, a DVD, a magneto-optical disk, an IC card, a ROM cartridge, a punched card, a printed matter on which a code such as a barcode is printed, and a computer internal storage device (RAM or ROM). A variety of computer-readable media are available, such as memory (e.g., memory) and external storage.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described in the following sections.
A. Example
A1. Configuration of route guidance device
A2. Operation of route guidance device
(1) Embodiment 1 of route guidance processing
(2) Embodiment 2 of route guidance processing
(3) Third Embodiment of Route Guidance Processing
(4) Fourth Embodiment of Route Guidance Processing
(5) Embodiment 5 of route guidance processing
B. Modified example
[0026]
A. Example
A1. Configuration of route guidance device
FIG. 1 is a configuration diagram illustrating a route guidance device 100 mounted on an automobile. The route guidance device 100 has a built-in computer, and includes a current position detection unit 102, a guidance information data reference unit 104, a difficulty determination unit 106, a display intersection determination unit 108, and a guidance information display, which are software-structured therein. It has means 110, a display screen 112, and input devices such as an operation panel and a mouse (not shown) for inputting instructions from a user of the route guidance device. It is to be noted that these units may be configured as hardware.
[0027]
The current position detecting means 102 detects the current position of the route guidance device 100. Various methods can be applied to the detection of the current position. For example, a method of detecting using the GPS (Global Positioning System) can be applied. In this case, the GPS is a DGPS (Differential GPS), an RTK-GPS (Real Time Kinetic-GPS), a VRS (Virtual Reference Station), and a VRS-RTK-GPS (Virtual Reference Station-Game Time-Response method). Is also possible.
[0028]
The guidance information data reference means 104 has a function of referring to the guidance information data 200 in which the intersection existing on the route and the guidance information thereof are associated. FIG. 2 is an explanatory diagram for explaining the data structure of the guidance information data 200. The guide information data 200 includes nodes N1, N2,... Corresponding to each intersection, position information (latitude, longitude) corresponding to the nodes N1, N2,..., And landmark information (shape, name, building, sign). ), And guidance information such as connection links L1 to L7 are stored. Here, the “shape” refers to an “image” that schematically represents the two-dimensional shape of the intersection in consideration of the actual road width and the number of lanes. In the guidance information data 200, for example, an image file name storing these images may be stored as shape data. The route guidance device 100 determines a route to be guided by a method such as a route search based on designation of a destination by a user. By referring to the guidance information data 200 based on this route, the route guidance device 100 can specify a guidance intersection, that is, an intersection where a course change such as a right turn or a left turn is performed.
[0029]
The difficulty determination unit 106 determines the specific difficulty of the guidance intersection by using the guidance information data reference unit 104. The difficulty of the determination is not limited to the bipolar determination such as “difficult” / “not difficult”, and an intermediate determination such as “somewhat difficult” may be added.
[0030]
In addition, the difficulty determination unit 106 includes a determination unit 106a that determines that it is difficult to specify the guidance intersection when the number of marks at the guidance intersection is equal to or less than a predetermined number. Specifically, when there is no information regarding the name, the building, and the sign in the mark information as the guide information, it is determined that it is difficult to specify the guide intersection.
[0031]
The display intersection determining means 108 determines a display intersection as an intersection to be displayed for guiding the guidance intersection, according to the determination result of the difficulty determining means 106. For example, when it is determined that the identification of the guidance intersection is “difficult”, the determination unit 108a determines the guidance intersection and the intersection before the guidance intersection as the display intersection. Further, when it is determined that the specification of the guidance intersection is “not difficult”, only the guidance intersection is determined as the display intersection.
[0032]
The determining unit 108a displays the preceding intersection even when the information regarding the landmark is determined to be equal to or less than the predetermined value by the determining unit 106a, when the guidance intersection and the intersection between the guidance intersection are separated by the predetermined value or more. And an exclusion unit 108b for exclusion.
[0033]
When the current position detecting means 102 detects that the vehicle is approaching the guidance intersection, the guidance information display means 110 uses the guidance information data reference means 104 to provide guidance information corresponding to the display intersection determined by the display intersection determination means 108. Is displayed on the display screen 112. For example, when a guidance intersection and an intersection before the guidance intersection are determined as display intersections, display is performed based on the guidance information associated with each. In addition, the display is performed based on the guidance information associated with only the guidance intersection as the display intersection.
[0034]
A2. Operation of route guidance device
(1) Embodiment 1 of route guidance processing
FIG. 3 is a flowchart of the route guidance processing according to the first embodiment. FIG. 4 is an explanatory diagram illustrating a state in which a moving object is guided to a predetermined route. In FIG. 4, “black filled triangles” indicate the current position of the moving object, and arrows indicate routes for guiding the moving object.
[0035]
This route guidance process is a process that is started after a route search process separately performed by the route guidance device 100. The display of the current position of the vehicle and the route to be traveled is performed in parallel in another process, and when the vehicle approaches the guidance intersection, the guided person, that is, the driver of the car, specifies the guidance intersection. The purpose is to provide guidance information such as marks to make it easier. This route search processing can be performed by referring to road network data (not shown) and utilizing the well-known Dijkstra method. Instead of the route search, the user may manually specify a travel route, or search for a travel route from a past travel history.
[0036]
First, it is determined whether or not the vehicle equipped with the route guidance device 100 has approached the guidance intersection (step S100). As shown in FIG. 4, in the present embodiment, the guidance intersection is the node N2 at which a left turn is to be made. Therefore, in step S100, it is determined whether or not an automobile approaches the node N2. If it is determined in step S100 that the car is not approaching the guidance intersection (node N2), the route guidance device 100 determines that there is no need to display guidance information, and ends this processing.
[0037]
In this step S100, when it is detected that the car has approached the guidance intersection, the information about the name, the building, and the sign among the landmark information as the guidance information is 1 at the guidance intersection (node N2). It is determined based on whether there is at least one (step S102). In the present embodiment, as shown in FIG. 2, since there is no information on the name, the building, and the sign at the guidance intersection (node N2), a negative determination is made.
[0038]
Subsequently, the process proceeds to step S112, where a display intersection is determined. In the present embodiment, in addition to the guidance intersection (node N2), an intersection in front of the guidance intersection (hereinafter, referred to as “front intersection”) (node N1) is determined as a display intersection.
[0039]
On the other hand, in step S102, when there is one or more information on the name, the building, and the sign at the guidance intersection (node N2), a positive determination is made, and the process proceeds to step S110, where the display intersection is the guidance intersection (node N2). Only determined.
[0040]
Finally, the process proceeds to step S114, where guidance information is displayed. In the present embodiment, the display is performed based on the guidance information associated with the guidance intersection (node N2) and the near intersection (node N1). FIG. 5 shows the display state. 5 is displayed based on the position information, the landmark information, and the connection destination node of the guidance information data 200. In FIG. 5, "circle A" is displayed as landmark information near the front intersection (node N1), so the driver of the car can use the guidance intersection (node N2) based on this information. Can be specified.
[0041]
(2) Embodiment 2 of route guidance processing
FIG. 6 is a flowchart of the route guidance processing according to the second embodiment. In the second embodiment, the same processes as those in the first embodiment shown in FIG. The second embodiment is different from the first embodiment shown in FIG. 3 in that a process of determining a display intersection according to the distance between the guidance intersection and the near intersection (step S104) is added. That is, even if there is no information on the name, building, and sign at the guidance intersection, if the distance between the guidance intersection and the near intersection is more than a predetermined value, the near intersection is excluded from the display intersection. Note that the distance between the guidance intersection (node N2) and the near intersection (node N1) can be determined from the position information (latitude, longitude) in the guidance information data 200. The distance used as the criterion in step S104 can be arbitrarily set, may be a fixed value, or may vary according to the map display scale in the route guidance processing, the number of landmarks at the front intersection, the traveling speed of the vehicle, and the like. Value. For example, when the speed is high, the predetermined distance may be increased so that the guide information can be displayed sufficiently short of the guide intersection.
[0042]
FIG. 7 shows a display state when the near intersection (node N1) is excluded from the display intersection. In FIG. 7, the near intersection as shown in FIG. 5 is not displayed, and only the guidance information corresponding to the guidance intersection (node N2) is displayed.
[0043]
By doing so, it is possible to avoid a problem that it is difficult to find the guidance intersection (for example, the display scale is reduced) due to the inclusion of the near intersection far from the original guidance intersection.
[0044]
(3) Third Embodiment of Route Guidance Processing
FIG. 8 is a flowchart as the third embodiment. In the third embodiment, the same processes as in the second embodiment shown in FIG. The third embodiment is different from the second embodiment shown in FIG. 6 in that a process (step S106) for determining a display intersection based on whether or not there is at least one information on the name, the building, and the sign of the near intersection is added. ing. That is, even if the distance between the guidance intersection and the near intersection is not more than a predetermined value, if there is no information on the name, building, and sign at the near intersection, the near intersection is excluded from the display intersection.
[0045]
In this way, a front intersection having low validity as a landmark can be excluded from the display intersection, and the inclusion of the front intersection makes it difficult to find the guidance intersection (for example, the display scale is reduced). Can be avoided.
[0046]
(4) Fourth Embodiment of Route Guidance Processing
FIG. 9 is a flowchart according to the fourth embodiment of the route guidance processing performed by the route guidance device 100. In the fourth embodiment, when determining whether or not to add the front intersection to the display intersection, it is determined whether or not there is guidance information such as a mark (step S106) and whether or not the shapes of the guidance intersection and the front intersection are similar (step S106). Step S108) is performed. The similarity of the shape is associated with the intersection existing on the route, and the classification information data (not shown) classified based on the two-dimensional shape of the intersection (for example, a cross, a cross, etc.) is used. it can. The section information data may be stored as a part of the guide information 200, or may be recorded in the map data as a type of attribute information for each node. In this processing, even if there is no information on the name, the building, and the sign at the near intersection, if the shapes of the guidance intersection and the near intersection are similar, the near intersection is included in the display intersection. As described above, information other than the guide information may be added to the determination as to whether or not to include the information at the display intersection.
[0047]
In this way, even when the intersections having similar shapes are continuous, it is possible to avoid overlooking the guidance intersection based on the display of the guidance information including the near intersection. For example, when the guidance intersection has a characteristic shape such as a cross, the guided person may determine the route using the intersection shape as one landmark. In such a case, there is a possibility that the guided person may mistake the guidance intersection in an area where the cross-shaped intersections are continuous. According to the display of the guidance information according to the fourth embodiment, it is possible to easily determine that the intersections having the T-shape are continuous, and it is possible to reduce the possibility of misinterpreting the guidance intersection.
[0048]
(5) Embodiment 5 of route guidance processing
FIG. 10 is a flowchart of the route guidance processing as the fifth embodiment. In the fifth embodiment, the same processes as those in the second embodiment shown in FIG. In the fifth embodiment, an example will be described in which at least three pieces of information serving as landmarks are provided together with the guidance intersection and the front intersection.
[0049]
As in the first embodiment, when it is determined that the vehicle has approached the guidance intersection (step S100), the route guidance device 100 executes a process for displaying guidance information. First, the route guidance device 100 determines whether or not there is a predetermined number or more of information serving as a mark at the guidance intersection (step S102). In this embodiment, it is assumed that “predetermined number = 3”.
[0050]
If there are more than a predetermined number of landmarks (step S102), it is determined that sufficient guidance information can be provided only by the guidance intersection, and the route guidance device 100 determines the guidance intersection as a display intersection (step S110). When the number of the marks is less than the predetermined number (step S102), the route guidance device 100 includes the near intersection within a predetermined distance from the guidance intersection in the display intersection (steps S104 and S112). At this time, a front intersection to which no landmark is associated may be excluded from the display intersection.
[0051]
In this way, a front intersection having low validity as a landmark can be excluded from the display intersection, and the inclusion of the front intersection makes it difficult to find the guidance intersection (for example, the display scale is reduced). Can be avoided.
[0052]
In this way, the route guidance device 100 sequentially adds the near intersection to the display intersection until the total number of landmarks of the guidance intersection and the near intersection exceeds a predetermined number (step S113).
[0053]
According to the route guidance apparatus 100 of the fifth embodiment, the provision of the information serving as the predetermined number of landmarks is ensured, so that there is an advantage that the guided person can easily identify the guidance intersection. In the fifth embodiment, only the lower limit value of the guidance information is determined (step S113), but the upper limit value may be additionally provided. By providing the upper limit value, it is possible to avoid complicated display.
[0054]
B. Modified example
(1) In all of the above embodiments, the road network data used for the route search process and the guide information data 200 used for the route guidance process are separated from each other. In this case, the overlapped data can be integrated into one, and there are merits such as reduction of data capacity and unified management of data.
[0055]
(2) In the above embodiments, the guide information data reference unit 104, the difficulty determination unit 106, the display intersection determination unit 108, and the guide information data 200 are integrally formed in the route guidance device 100, but are not limited thereto. , May be configured separately. When they are configured separately, it is possible to adopt a configuration in which both are connected via a network.
[0056]
(3) In the above embodiments, the moving body is described as an automobile, but is not limited thereto, and may be a pedestrian. In this case, the pedestrian can receive the guidance information using a device such as a mobile phone or a PDA.
[0057]
(4) In the above embodiment, it is assumed that it is difficult to specify the guide intersection when the information on the guide intersection is less than or equal to a predetermined number. However, the present invention is not limited to this. When the evaluation value is equal to or less than a predetermined value, it may be difficult to specify the guidance intersection. For example, when a department store or a general store is used as a landmark, a method of giving a high evaluation value “10” to a department store and a low evaluation value “1” to a general store in consideration of easy visibility is used. No. If the sum of the evaluation values of the landmarks around each intersection is used as the evaluation value of the intersection, the difficulty can be quantitatively evaluated in consideration of the visibility of each landmark. The evaluation value for the mark may be set according to the attribute of a feature such as a department store or a general store, or may be individually set for each feature. In the latter example, for example, even in an area where department stores stand at each intersection, such as a downtown area, and department stores cannot always be useful landmarks, an appropriate evaluation value reflecting such circumstances is set. It becomes possible.
[0058]
Although various embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that various configurations can be adopted without departing from the spirit of the present invention.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a route guidance device 100.
FIG. 2 is an explanatory diagram for explaining a data structure of guidance information data 200.
FIG. 3 is a flowchart according to a first embodiment of a route guidance process performed by the route guidance device 100;
FIG. 4 is an explanatory diagram illustrating how a moving object is guided to a predetermined route.
FIG. 5 shows a display state of guidance information including a near intersection.
FIG. 6 is a flowchart according to a second embodiment of the route guidance processing performed by the route guidance device 100;
FIG. 7 shows a display state of guidance information only for a guidance intersection.
FIG. 8 is a flowchart according to a third embodiment of the route guidance processing performed by the route guidance device 100;
FIG. 9 is a flowchart according to a fourth embodiment of the route guidance processing performed by the route guidance device 100;
FIG. 10 is a flowchart according to a fifth embodiment of the route guidance processing performed by the route guidance device 100;
[Explanation of symbols]
100 ... route guidance device
102 ... Current position detecting means
104: guidance information data reference means
106 ... Difficulty judgment means
106a ... Judgment unit
108 ... display intersection determination means
108a ... Determining unit
108b: Excluded part
110 ... Guidance information display means
112 ... Display screen
200… Guidance information data

Claims (7)

A route guidance device that performs display for guiding a guidance intersection at which a course change should be performed when guiding a predetermined route,
A route information acquisition unit that acquires route information that specifies the predetermined route;
Guidance information data reference means for referring to guidance information data in which the intersection existing on the route and the guidance information are associated with each other;
Difficulty determining means for determining the difficulty when the guided person specifies the guidance intersection based on a predetermined rule,
A display intersection determining means for determining a display intersection as an intersection displayed in a guidance image displayed including the guidance information in order to guide the guidance intersection, in accordance with a determination result of the difficulty determination means;
Guidance information display means for displaying guidance information corresponding to the display intersection determined by the display intersection determination means, using the guidance information data reference means;
A route guidance device comprising: The route guidance device according to claim 1,
The route guidance device, wherein the difficulty determination unit performs the determination using the guidance information data reference unit. The route guidance device according to claim 2,
The guidance information includes information about a landmark of the intersection,
The route guidance device, wherein the difficulty determination unit performs the determination on the guidance intersection based on information on the landmark. The route guidance device according to claim 1,
The route guidance device, wherein the display intersection determination unit includes, when the difficulty determination unit determines that it is difficult to identify the guidance intersection, including an intersection on the route before the guidance intersection in the display intersection. The route guidance device according to claim 4,
The route guidance device that determines the display intersection for an intersection within a predetermined distance from the guidance intersection. Using a computer, in the vicinity of a guidance intersection where a course change should be performed, a display for guiding the guidance intersection is performed, and a route guidance method of guiding a predetermined route,
A step of acquiring route information that specifies the predetermined route;
A guidance information data reference step of referring to guidance information data in which the intersection existing on the route and the guidance information are associated with each other;
A difficulty determination step of determining a difficulty when the guided person specifies the guidance intersection based on a predetermined rule;
A display intersection determining step of determining a display intersection as an intersection displayed in a guide image displayed including the guide information in order to guide the guide intersection according to the determination result of the difficulty determining step;
A guidance information display step of displaying guidance information corresponding to the display intersection determined in the display intersection determination step, using the guidance information data reference step;
A route guidance method comprising: A computer program for performing guidance for a predetermined route by performing a display for guiding the guidance intersection in the vicinity of the guidance intersection where the course should be changed,
A function of acquiring route information that specifies the predetermined route;
A guide information data reference function for referring to guide information data in which the intersection existing on the route and the guide information thereof are associated with each other;
A difficulty determination function for determining a difficulty when the guided person specifies the guidance intersection based on a predetermined rule;
A display intersection determining function of determining a display intersection as an intersection displayed in a guidance image displayed including the guidance information in order to guide the guidance intersection, in accordance with a determination result of the difficulty determination unit;
Using the guide information data reference function, a guide information display function of displaying guide information corresponding to the display intersection determined by the display intersection determination function,
Computer program for realizing by a computer.

Images