JP6479581B2 - Navigation device and road traffic information target area display control method - Google Patents

Description

  The present invention relates to a navigation device and a road traffic information target area display control method, and is particularly suitable for use in a navigation device having a function of displaying a wide range of road traffic information received using FM broadcast radio waves. is there.

  In general, a navigation device has a function of receiving road traffic information sent from a road traffic information center using VICS (registered trademark) and displaying a constantly changing road condition on a navigation screen. Yes. Road traffic information can be acquired from beacons installed on the road or FM multiplex broadcasting using FM broadcast radio waves.

  The road traffic information includes three types of information of level 1, level 2, and level 3. Level 1 is character information that informs the traffic information, the required time to a predetermined point, and the like by characters. Level 2 is simple graphic information (image data based on a bitmap or the like) that informs traffic jam information, a required time to a predetermined point, and the like by a simple graphic. Level 3 is map information that informs traffic jam information by colored arrows on the map. Level 3 map information (colored arrows) is always displayed on the map screen, whereas level 1 text information and level 2 simple graphic information are displayed as an interrupt when the navigation device receives these information. Is done.

  Note that the level 2 simple graphic information that is interrupted and displayed in response to reception from a beacon installed on the road represents the traffic state in the direction that the vehicle will go after passing through the installation position of the beacon. Therefore, when driving in an unfamiliar area, even if the road traffic information is presented, the user cannot immediately know where the road traffic information represents the traffic state, This road traffic information may not be used effectively.

  Conventionally, in order to solve such a problem, a technique has been proposed in which a user can easily grasp the position where the road traffic information represents the traffic state of the level 2 road traffic information received from the beacon. (For example, refer to Patent Document 1). In the navigation device described in Patent Document 1, when road traffic information is received, a first window 710 and a second window 720 are set on the display device as shown in FIG. 8, and a traffic information position presentation image is displayed in the first window. The received road traffic information is displayed in the second window 720 while being displayed in 710.

  Here, the traffic information position presentation image displayed in the first window 710 represents the current position on the map image 711 in which the map display range and the display map scale are set so that the current position and the traffic information reference position are included. It is assumed that a current position mark 712 and a traffic information reference position mark 713 representing a traffic information reference position are arranged. The traffic information reference position is the position of the nearest intersection with respect to the current position on the direction guidance map included in the received road traffic information.

JP 2008-249475 A

  As shown in FIG. 8, even if the map display scale is changed to include the current position and one intersection whose traffic state is represented by level 2 road traffic information received from a beacon on the road, No major scale changes occur. This is because the intersection that is the display target of the traffic state is not so far away from the current position.

  However, the road traffic information provided in the next-generation VICS is not limited to information on one intersection in the traveling direction of the vehicle, but is distributed as area information representing road traffic information in a wide section. Moreover, since the road traffic information of the next generation VICS is distributed using FM broadcast radio waves, the received information may include road traffic information of a plurality of areas within the FM broadcast area. There is sex. In this case, if the display scale of the map is changed so that the plurality of areas and the current position are included, the scale becomes an extremely wide scale, and the visibility of the map is deteriorated.

  The present invention has been made in order to solve such problems, and a wide range of road traffic information distributed using FM broadcast radio waves can be used for traffic conditions without reducing the visibility of the map as much as possible. An object is to allow the user to easily grasp the position represented.

In order to solve the above-described problem, in the present invention, a road that satisfies a predetermined condition with respect to the current position from one or more road traffic information included in a wide range received using FM broadcast radio waves. Extract traffic information. Then, an area graphic representing an area on the map corresponding to the extracted road traffic information is arranged on the map image having the maximum scale including the position corresponding to the extracted road traffic information and the current position. An area presentation image is generated. When extracting the road traffic information, road traffic information at a position that satisfies the condition that it can be reached by the road regulation end time is extracted based on the current position, the vehicle speed information, and the road regulation end time included in the road traffic information. In another aspect, when extracting the road traffic information, the road traffic information of a position that satisfies the condition that it is on the destination side of the guide route with respect to the current position and is on the current position side of the destination of the guide route. To extract. In another aspect, when the road traffic information is extracted, the road traffic information at a position that satisfies the condition that the current position is on the traveling direction side is extracted.

  According to the present invention configured as described above, it is not an extremely small scale that includes positions corresponding to all of one or more road traffic information included in a wide range received using FM broadcast radio waves, Since the map image is generated at a scale that includes a position corresponding only to the road traffic information extracted based on the predetermined condition, it is possible to suppress the scale from becoming an extremely wide scale. Thereby, the user can easily grasp the position where the wide-area road traffic information represents the traffic state without reducing the visibility of the map as much as possible.

It is a block diagram which shows the function structural example of the navigation apparatus by this embodiment. It is a figure which shows the operation example of the road traffic information extraction part performed when the guidance route is not set in this embodiment. It is a figure which shows the operation example of the road traffic information extraction part performed when the guidance route is set in this embodiment. It is a figure which shows the example of a display of the area presentation image in this embodiment. It is a flowchart which shows the operation example (processing procedure of the target area display control method of road traffic information) of the navigation apparatus by this embodiment. It is a figure which shows the other example of a display of the area presentation image in this embodiment. It is a figure which shows the other example of a display of the area presentation image in this embodiment. It is a figure which shows the example of a display of the conventional road traffic information (simple figure information of level 2).

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a functional configuration example of the navigation device according to the present embodiment. As shown in FIG. 1, the navigation apparatus 100 of this embodiment includes a map data storage unit 1, a current position measurement unit 2, a map reading unit 3, a map buffer memory 4, a map drawing unit 5, a route search unit 6, and a guidance route. A memory 7, a guidance route drawing unit 8, a display control unit 9, a display 10, a road traffic information receiving unit 11, a road traffic information extracting unit 12, and an area presentation image drawing unit 13 are provided.

  The map data storage unit 1 stores various types of map data necessary for map display, route search, and the like. The map data storage unit 1 is composed of a recording medium such as a hard disk, DVD, CD-ROM, or semiconductor memory. The current position measuring unit 2 measures the current position of the vehicle. The current position measuring unit 2 is configured using a self-contained navigation sensor and a GPS receiver.

  The map reading unit 3 controls reading of map data from the map data storage unit 1. Specifically, the map reading unit 3 inputs the current position information of the vehicle from the current position measuring unit 2, reads a predetermined range of map data including the current position from the map data storage unit 1, and stores it in the map buffer memory 4. Store. Further, when searching for a guidance route, the map reading unit 3 reads out a predetermined range of map data including the departure point (current position) and the destination from the map data storage unit 1 and supplies the map data to the route searching unit 6. To do.

  Further, when the area presentation image is displayed based on the road traffic information of the next generation VICS received by the road traffic information receiving unit 11, the map reading unit 3 has a range within the range specified by the area presentation image drawing unit 13. Map data is read from the map data storage unit 1 and supplied to the area presentation image drawing unit 13. The details of this operation will be described later.

  The map drawing unit 5 generates map drawing data around the vehicle position based on the map data stored in the map buffer memory 4. Here, the map drawing unit 5 draws a map image at a scale specified by the user. The route search unit 6 uses the map data read from the map data storage unit 1 by the map reading unit 3 to search for a guide route with the lowest cost connecting the current position to the destination, and the searched guide route. Is stored in the guide route memory 7.

  The guide route drawing unit 8 generates guide route drawing data using the guide route data stored in the guide route memory 7. That is, the guidance route drawing unit 8 selectively reads out the data included in the map area drawn by the map drawing unit 5 from the guidance route data stored in the guidance route memory 7 and superimposes it on the map image. A guide route that is boldly emphasized with a predetermined color different from other roads is drawn.

  The display control unit 9 displays on the display 10 the map image drawn by the map drawing unit 5, the guidance route image drawn by the guidance route drawing unit 8, and the area presentation image drawn by the area presentation image drawing unit 13. Control to do. When the guide route is not set, the display control unit 9 displays the map image drawn by the map drawing unit 5 on the display 10. When the guidance route is set, the display control unit 9 causes the display 10 to display the guidance route image drawn by the guidance route drawing unit 8 on the map image drawn by the map drawing unit 5. .

  Furthermore, when an area presentation image is generated by the area presentation image drawing unit 13, the display control unit 9 interrupts and displays the area presentation image on the display 10 for a predetermined time. Note that the interrupt display of the area presentation image may be performed on the entire screen instead of the image generated by the map drawing unit 5 and the guidance route drawing unit 8. Alternatively, the display 10 is divided into two screens so that the image generated by the map drawing unit 5 and the guidance route drawing unit 8 and the area presentation image generated by the area presentation image drawing unit 13 are displayed on each screen. It may be.

  The road traffic information receiving unit 11 receives a wide range of road traffic information (road traffic information of the next generation VICS) distributed as area information using FM broadcast radio waves. The road traffic information receiving unit 11 repeatedly receives road traffic information every predetermined time (for example, 5 minutes). The road traffic information received by the road traffic information receiving unit 11 relates to one or more areas within the broadcast area covered by the FM broadcast station that can be received at the current position.

  The road traffic information includes information indicating the road section to be regulated, the regulation time, and the regulation target area. Here, the road section to be restricted is information indicating a road section in which traffic is restricted by road construction or various events. The restriction time is information indicating the start time and end time of the restriction. The target area is information indicating the position of an area specified by, for example, a rectangular area, and a road section to be regulated is included in this area.

  The road traffic information extraction unit 12 extracts the road traffic information at a position that satisfies a predetermined condition with respect to the current position from the one or more road traffic information received by the road traffic information reception unit 11. The road traffic information extraction unit 12 operates only when there is a change in the content of the previous traffic traffic information received by the road traffic information reception unit 11 every 5 minutes. That is, the road traffic information extraction unit 12 compares the content of the road traffic information received this time by the road traffic information reception unit 11 with the content of the road traffic information received by the road traffic information reception unit 11 five minutes ago, Only when the contents are different, the road traffic information extraction process is executed.

  The predetermined condition used when the road traffic information extracting unit 12 extracts the road traffic information is different between a case where the guide route is not set and a case where the guide route is set. When the guide route is not set, the road traffic information extracting unit 12 includes the current position measured by the current position measuring unit 2 and vehicle speed information acquired via an in-vehicle network such as a CAN (Controller Area Network). Based on the road regulation end time included in the road traffic information, road traffic information at a position that satisfies the condition that it can be reached by the road regulation end time is extracted. This is intended to exclude such road traffic information because road traffic information that cannot be reached before the road regulation end time is considered to be almost unnecessary.

  On the other hand, when the guide route is set, the road traffic information extracting unit 12 sets the condition that the guide route is on the destination side of the guide route and is on the current position side with respect to the destination of the guide route. Extract the road traffic information of the position that satisfies. This is intended to exclude road traffic information in areas other than the traveling direction, since road traffic information other than the traveling direction along the guidance route is considered unnecessary during the setting of the guidance route.

  FIG. 2 is a diagram illustrating an operation example of the road traffic information extraction unit 12 that is executed when the guide route is not set. The example of FIG. 2 shows a situation where road traffic information regarding the three areas A1 to A3 is received by the road traffic information receiving unit 11. For example, the road traffic information extracting unit 12 travels from the current position P to each area A1 to A3 and travels at a constant speed at the current vehicle speed on a straight line connecting the current position P and each area A1 to A3 with the shortest distance. Assuming that the time T1 to T3 required to travel from the current position P to each of the areas A1 to A3 is calculated.

  Since the road traffic information includes information indicating the positions of the areas A1 to A3, it is possible to obtain the shortest distance from the current position P to each of the areas A1 to A3 and divide it by the vehicle speed. Thus, it is possible to calculate the times T1 to T3 required for traveling to each of the areas A1 to A3. And the arrival time to each area A1-A3 can be obtained by adding the travel time T1-T3 to the present time. The road traffic information extraction unit 12 compares the arrival times to the areas A1 to A3 calculated in this way with the road regulation end times of the areas A1 to A3. Judge that it can be reached by the end time.

  In addition, although the example which performs calculation using the actual vehicle speed obtained from a vehicle-mounted network was demonstrated here, it is not limited to this. For example, the calculation may be performed using the legal speed (obtained from the map data) of the road that is currently running. Further, the calculation may be performed using a current vehicle speed or a speed 1 / n (n is an arbitrarily determined constant) of the legal speed. Since the road that travels from the current position P to each of the areas A1 to A3 is not actually a straight line, the actual travel distance is longer than the straight distance. It is also conceivable to stop temporarily while waiting for a signal during traveling. Therefore, it is preferable to calculate using the current vehicle speed or the speed 1 / n of the legal speed in consideration of such an actual traveling state.

  Moreover, although FIG. 2 demonstrated the example which calculates the driving time from the current position P to the nearest position of each area A1-A3, this invention is not limited to this. For example, the travel time from the current position P to the farthest position in each area A1 to A3, the travel time to the center position of each area A1 to A3, and the like may be calculated.

  FIG. 3 is a diagram illustrating an operation example of the road traffic information extraction unit 12 executed when a guidance route is set. The example of FIG. 3 also shows a situation in which road traffic information regarding the three areas A1 to A3 is received by the road traffic information receiving unit 11. The road traffic information extraction unit 12 is road traffic information that is on the destination G side of the guidance route with respect to the current position P, and in the region on the current position P side of the destination G of the guidance route (indicated by hatching). To extract. In the example of FIG. 3, the road traffic information of area A3 is extracted.

  The area presentation image drawing unit 13 includes the current position measured by the current position measurement unit 2 and the position corresponding to the road traffic information extracted by the road traffic information extraction unit 12 (the entire target area). The drawing data of the area presentation image formed by arranging the area graphic representing the position of the road traffic information extracted by the road traffic information extraction unit 12 on the map image with the scale set is generated.

  For example, as shown in FIG. 3, when only the road traffic information of the area A3 is extracted by the road traffic information extraction unit 12, the area presentation image drawing unit 13 sets the maximum scale including the current position P and the area A3. The set map image is generated, and the rectangular area graphic representing the position of the area A3 is arranged on the map image, thereby generating the drawing data of the area presentation image. Here, the maximum scale is a scale in which both the current position P and the area A3 are included in one screen among a plurality of scales that can be displayed by the navigation device 100, and the largest scale among them. That means.

  The area presentation image generated by the area presentation image drawing unit 13 in this way is displayed on the display 10 by the display control unit 9. FIG. 4 is a diagram illustrating a display example of the area presentation image. As shown in FIG. 4, the area presentation image is a map image drawn at the maximum scale where the current position P and the area A3 enter one screen, and the vehicle representing the current position P on the map image. A position mark 41 and a rectangular area graphic 42 representing the position of the area A3 are drawn in an overlapping manner. Note that when the user presses the area graphic 42, the content of the road traffic information corresponding to the area A3 can be displayed in a pop-up manner.

  FIG. 5 is a flowchart showing an operation example (a processing procedure of the target area display control method for road traffic information) of the navigation device 100 configured as described above according to the present embodiment. The flowchart shown in FIG. 5 is executed until the power is turned off after the navigation apparatus 100 is turned on.

  First, the road traffic information receiving unit 11 receives next-generation VICS road traffic information using FM broadcast radio waves (step S1). Next, the road traffic information extracting unit 12 determines whether the content of the road traffic information received by the road traffic information receiving unit 11 this time is different from the content of the road traffic information received by the road traffic information receiving unit 11 five minutes ago. It is determined whether or not (step S2).

  When the content of the road traffic information is not different from the previous time, the road traffic information receiving unit 11 determines whether 5 minutes have passed since the previous reception (step S3). If five minutes have not elapsed since the previous reception, the determination in step S3 is repeated. On the other hand, when 5 minutes have passed since the previous reception, the process returns to step S1, and the road traffic information receiving unit 11 receives the road traffic information again.

  If the content of the road traffic information received this time is different from the content of the road traffic information received 5 minutes ago, the road traffic information extraction unit 12 determines whether a guidance route is set (step S4). . When the guide route is set, the road traffic information extracting unit 12 satisfies the condition when the guide route is set from the one or more road traffic information received by the road traffic information receiving unit 11 Road traffic information is extracted (step S5).

  On the other hand, when the guide route is not set, the road traffic information extracting unit 12 sets the condition when the guide route is not set from the one or more road traffic information received by the road traffic information receiving unit 11. The road traffic information at the position to be satisfied is extracted (step S6).

  After the road traffic information extraction unit 12 extracts the road traffic information in either step S5 or step S6, the area presentation image drawing unit 13 reads the current position measured by the current position measurement unit 2 and the road traffic information. An area graphic representing the position of the road traffic information extracted by the road traffic information extraction unit 12 is placed on a map image having a maximum scale that includes the position corresponding to the road traffic information extracted by the extraction unit 12. The drawing data of the area presentation image is generated (step S7).

  Then, the display control unit 9 interrupts and displays the area presentation image generated by the area presentation image drawing unit 13 on the display 10 for a predetermined time (step S8). Thereafter, the navigation device 100 determines whether or not an operation for turning off the power has been performed (step S9). If no operation to turn off the power is performed, the process returns to step S3. On the other hand, when an operation to turn off the power is performed, the processing of the flowchart illustrated in FIG. 5 ends.

  As described above in detail, in the present embodiment, road traffic at a position that satisfies a predetermined condition with respect to the current position from one or more road traffic information included in a wide range received by the road traffic information receiving unit 11. Information is extracted by the road traffic information extraction unit 12. Then, an area presentation image in which an area graphic representing the position of the extracted road traffic information is arranged on the map image set with the maximum scale including the position corresponding to the extracted road traffic information and the current position It is generated by the presentation image drawing unit 13 and is displayed on the display 10.

  According to the present embodiment configured as described above, a predetermined scale is used instead of an extremely small scale that includes positions (for example, areas A1 to A3) corresponding to all of one or more road traffic information included in a wide range. Since the map image is generated at a scale that includes only the position corresponding to the road traffic information extracted based on the conditions (for example, area A3), the scale is prevented from becoming an extremely wide scale. Can do. Thereby, the user can easily grasp the position where the wide-area road traffic information represents the traffic state without reducing the visibility of the map as much as possible. In addition, in the present embodiment, since the area presentation image is generated by excluding the area of road traffic information that is highly likely to be unnecessary, road traffic information useful for the user can be easily grasped in the target area. Can be provided.

  In the above embodiment, when the guide route is not set, the road traffic information extracting unit 12 moves from the current position P to the closest position (or the farthest position, the center position, etc.) of each of the areas A1 to A3. Example of calculating the travel time of the vehicle, determining whether it can be reached by the road regulation end time of each of the areas A1 to A3, and displaying an area graphic representing the whole of the reachable area in the area presentation image However, the present invention is not limited to this.

  For example, for an area that can be reached from the current position P to the nearest position, it is determined which position in the area can be reached, and an area presentation image in which area figures up to a position that can be reached by the road regulation end time are arranged. You may make it draw. For example, among the three areas A1 to A3 in which the road traffic information is received by the road traffic information reception unit 11, only the area A3 is extracted by the road traffic information extraction unit 12 as an area that can be reached by the road regulation end time. Suppose.

  In this case, the road traffic information extraction unit 12 further determines to which position in the area A3 the vehicle can reach before the road regulation end time of the area A3 arrives. If the road traffic information extraction unit 12 determines that the farthest position in the area A3 from the current position P can be reached earlier than the road regulation end time of the area A3, the area presentation image drawing unit 13 Is drawn as an area graphic in the area presentation image. As a result, the area presentation image displayed by the display control unit 9 is in the same state as in FIG.

  On the other hand, when the road traffic information extracting unit 12 determines that the vehicle can reach only a halfway position in the area A3 by the road regulation end time of the area A3, the area presentation image drawing unit 13 Then, an area presentation image is drawn in which area figures up to a position that can be reached by the road regulation end time are arranged. As a result, the area presentation image displayed by the display control unit 9 is as shown in FIG. In the area presentation image shown in FIG. 6, the area graphic 42 ′ representing the position of the area A <b> 3 has a shape in which an area that cannot be reached by the road regulation end time of the area A <b> 3 is cut.

  In the example of FIG. 6, the scale of the map image is the same as that of FIG. However, if the current position P and the area graphic 42 ′ enter a single screen even if the scale is reduced by one step by making a small area graphic 42 ′ that is an area that cannot be reached by the road regulation end time, the 1 An area presentation image is generated using a map image that is larger in stages.

  In the above embodiment, road traffic information is distributed as rectangular area information, and the navigation apparatus 100 that has received the information has described an example of generating and displaying an area presentation image in which rectangular area figures are arranged. The present invention is not limited to this. For example, when road traffic information is distributed as area information having a circular shape or other shapes, an area presentation image in which area figures having a circular shape or other shapes are arranged is generated and displayed accordingly.

  Moreover, although the said embodiment demonstrated the example in which the road traffic information extraction part 12 extracts road traffic information according to different conditions with the case where a guidance route is not set and the case where a guidance route is set, The road traffic information may be extracted according to the same conditions regardless of whether or not the guide route is set. For example, the road traffic information extracting unit 12 may extract road traffic information at a position that satisfies a condition that the current position is on the traveling direction side.

  In addition, when a guidance route is set, the road traffic information extraction unit 12 extracts road traffic information according to an AND condition of the condition described using FIG. 2 and the condition described using FIG. You may do it. Alternatively, road traffic information may be extracted in accordance with an AND condition of the condition that the current position is on the traveling direction side and the condition described with reference to FIG. Good.

  Moreover, in the said embodiment, although the area corresponding to the road traffic information which was not extracted by the road traffic information extraction part 12 may enter into the map image of the scale set by the area presentation image drawing part 13 accidentally. The example in which the area graphic of the unextracted area is not drawn on the area presentation image has been described, but may be drawn.

  Moreover, in the said embodiment, the area which does not accidentally enter into the map image of the scale set by the area presentation image drawing part 13 among the areas corresponding to the road traffic information which was not extracted by the road traffic information extraction part 12 Of course, the area graphic is not drawn on the area presentation image. On the other hand, as shown in FIG. 7, when an icon 71 indicating the direction in which the unextracted area exists is displayed on the area presentation image and the icon 71 is pressed by the user, the road traffic in the unextracted area is displayed. Information may be popped up.

  In addition, each of the above-described embodiments is merely an example of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

DESCRIPTION OF SYMBOLS 9 Display control part 11 Road traffic information receiving part 12 Road traffic information extraction part 13 Area presentation image drawing part

Claims (7)

A road traffic information receiving unit for receiving a wide range of road traffic information distributed as area information using FM broadcast radio waves;
A road traffic information extracting unit that extracts road traffic information at a position that satisfies a predetermined condition with respect to a current position among the one or more road traffic information received by the road traffic information receiving unit;
Corresponding to the current position and the road traffic information extraction unit sets the maximum scale that contains the position corresponding to the road traffic information extracted by the on the map image, the road traffic information extracted by the road traffic information extracting section An area presentation image drawing unit for generating an area presentation image formed by arranging area graphics representing areas on the map to be
A display control unit for displaying the area presentation image generated by the area presentation image drawing unit ,
The road traffic information extraction unit obtains road traffic information at a position that satisfies a condition that the road traffic can be reached by the road regulation end time based on the current position, vehicle speed information, and road regulation end time included in the road traffic information. A navigation device characterized by extracting . The area presentation image drawing unit arranges an area graphic representing an area up to a position that can be reached by the road regulation end time in the area indicated by the road traffic information extracted by the road traffic information extraction unit. The navigation apparatus according to claim 1 , wherein an area presentation image is generated. A road traffic information receiving unit for receiving a wide range of road traffic information distributed as area information using FM broadcast radio waves;
A road traffic information extracting unit that extracts road traffic information at a position that satisfies a predetermined condition with respect to a current position among the one or more road traffic information received by the road traffic information receiving unit;
Corresponds to the road traffic information extracted by the road traffic information extraction unit on the map image having the maximum scale including the current position and the position corresponding to the road traffic information extracted by the road traffic information extraction unit An area presentation image drawing unit for generating an area presentation image formed by arranging area graphics representing areas on the map to be
A display control unit for displaying the area presentation image generated by the area presentation image drawing unit,
The road traffic information extraction unit extracts road traffic information at a position that satisfies a condition that the current position is on the destination side of the guidance route and is on the current position side of the destination of the guidance route. features and to Luna navigation device to. A road traffic information receiving unit for receiving a wide range of road traffic information distributed as area information using FM broadcast radio waves;
A road traffic information extracting unit that extracts road traffic information at a position that satisfies a predetermined condition with respect to a current position among the one or more road traffic information received by the road traffic information receiving unit;
Corresponds to the road traffic information extracted by the road traffic information extraction unit on the map image having the maximum scale including the current position and the position corresponding to the road traffic information extracted by the road traffic information extraction unit An area presentation image drawing unit for generating an area presentation image formed by arranging area graphics representing areas on the map to be
A display control unit for displaying the area presentation image generated by the area presentation image drawing unit,
The road traffic information extracting unit, the features and to Luna navigation device to extract a road traffic information satisfying position that is in the traveling direction with respect to the current position. A first step in which a road traffic information receiving unit of the navigation device receives a wide range of road traffic information distributed as area information using FM broadcast radio waves;
A road traffic information extraction unit of the navigation device extracts second road traffic information at a position that satisfies a predetermined condition with respect to a current position from one or more road traffic information received by the road traffic information reception unit. And the steps
The road traffic information is displayed on the map image in which the area presentation image drawing unit of the navigation device sets the maximum scale including the current position and the position corresponding to the road traffic information extracted by the road traffic information extraction unit. A third step of generating an area presentation image formed by arranging area graphics representing areas on the map corresponding to the road traffic information extracted by the extraction unit;
Display control unit of the navigation apparatus, possess a fourth step of displaying the area presenting image generated by the area presenting image drawing unit,
In the second step, the road traffic information extraction unit satisfies a condition that the road traffic end information can be reached by the road regulation end time based on the current position, the vehicle speed information, and the road regulation end time included in the road traffic information. A target area display control method for road traffic information, characterized by extracting road traffic information at a satisfying position .   A first step in which a road traffic information receiving unit of the navigation device receives a wide range of road traffic information distributed as area information using FM broadcast radio waves;
  A road traffic information extraction unit of the navigation device extracts second road traffic information at a position that satisfies a predetermined condition with respect to a current position from one or more road traffic information received by the road traffic information reception unit. And the steps
  The road traffic information is displayed on the map image in which the area presentation image drawing unit of the navigation device sets the maximum scale including the current position and the position corresponding to the road traffic information extracted by the road traffic information extraction unit. A third step of generating an area presentation image formed by arranging area graphics representing areas on the map corresponding to the road traffic information extracted by the extraction unit;
  A display control unit of the navigation device includes a fourth step of displaying the area presentation image generated by the area presentation image drawing unit;
  In the second step, the road traffic information extraction unit satisfies a condition that the information is on a destination side of the guidance route with respect to the current position, and on the current position side of the destination of the guidance route. Extract road traffic information of location
  A target area display control method for road traffic information.   A first step in which a road traffic information receiving unit of the navigation device receives a wide range of road traffic information distributed as area information using FM broadcast radio waves;
  A road traffic information extraction unit of the navigation device extracts second road traffic information at a position that satisfies a predetermined condition with respect to a current position from one or more road traffic information received by the road traffic information reception unit. And the steps
  The road traffic information is displayed on the map image in which the area presentation image drawing unit of the navigation device sets the maximum scale including the current position and the position corresponding to the road traffic information extracted by the road traffic information extraction unit. A third step of generating an area presentation image formed by arranging area graphics representing areas on the map corresponding to the road traffic information extracted by the extraction unit;
  A display control unit of the navigation device includes a fourth step of displaying the area presentation image generated by the area presentation image drawing unit;
  In the second step, the road traffic information extracting unit extracts road traffic information at a position that satisfies a condition that the road traffic information is in a traveling direction with respect to the current position.
  A target area display control method for road traffic information.