JP2010203975A - In-vehicle navigation apparatus and route display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-vehicle navigation apparatus and a route display method, allowing a user to easily know a running easiness on a road as a searched guide path. <P>SOLUTION: The in-vehicle navigation apparatus has: a display means; a storage means for storing a running easiness map data including a map data and a running easiness rank in a particular road zone; a control means for searching the route from a departure place to a destination based on the map data and the running easiness map data; and a route rendering means for displaying the route on a screen of the display means. The control means represents the searched route as a band-shaped graph, categorizes the route in the running easiness ranks, generates a data in a display form (a width and a color) corresponding to the running easiness rank from the band-shaped graph, and displays the band-shaped graphs (route graphs) 41-43 on the screen of the display means in the route rendering means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an in-vehicle navigation device and a route display method for searching for a route from a departure point to a destination and displaying the route on a screen of a display device.

  In a typical in-vehicle navigation device, a control unit such as a CPU for controlling all processing related to navigation, a storage device such as a DVD-ROM storing map data, a display device, and a current position of the own vehicle are detected. GPS receiver, a gyro for detecting the traveling direction and traveling speed of the own vehicle, a vehicle speed sensor, and the like are provided. Then, the control unit reads out map data including the current position of the vehicle from the storage device, draws a map image around the vehicle position based on the map data, and displays the current position of the vehicle. The vehicle position mark to be indicated is displayed superimposed on the screen, the map image is scrolled according to the movement of the vehicle, the map image is fixed on the screen and the vehicle position mark is moved, You can see at a glance where your vehicle is currently driving.

  In-vehicle navigation devices are usually equipped with a function (route guidance function) that guides the user so that the user can travel to the destination set by the user without making a mistake. According to this route guidance function, the control unit performs a simulation calculation such as a horizontal search method or a Dijkstra method using the map data to find an optimum route from the departure point (for example, the current position of the vehicle) to the destination. Go and search, store the searched route as a guide route, and display the guide route on the map image so that it can be distinguished from other roads while driving, or to the approaching intersection on the guide route When a predetermined distance is reached, by displaying a map of the intersection on the map image (enlarged view of the intersection, an arrow indicating the direction of travel at the intersection, the distance to the intersection, the name of the intersection, etc.) The user can grasp which road to drive and in which direction to proceed at the intersection.

  A plurality of such guidance routes are searched based on a plurality of conditions such as distance priority, required time priority, general road priority, and toll road priority. The user selects a route by comparing a plurality of guide routes, and route guide processing is performed along the selected route.

  As a technique for easily comparing the plurality of searched guidance routes, for example, Patent Document 1 shows a planar map image including a plurality of searched routes, and altitude changes and distances of the plurality of routes. A navigation device that displays a cross-sectional image on a screen is described.

  Further, in Patent Document 2, each of a plurality of searched routes is formed into a folded band graph divided for each road type, and an image whose height and color are changed according to the road type is displayed separately from the map screen. A navigation device is described.

JP 2002-350169 A JP 2006-267079 A

  As described above, when the display mode is changed, such as simply changing the color of the road on the map screen by displaying the detected route so that the road type can be understood or displaying the altitude. It is easier to understand.

  However, the type of road does not always match the ease of travel when traveling on the road. For example, when the searched national road is narrower than the prefectural road or includes many curves, the prefectural road is easier for the user to travel. Even when the altitude of the road becomes high, it does not necessarily mean that it is difficult to travel depending on the road width and the like. Thus, even if the road type is clearly shown, it is difficult to grasp the ease of running on the road.

  The present invention was created in view of the problems in the prior art, and provides an in-vehicle navigation device and a route display method that allow a user to easily understand the ease of running on the searched guidance route on the road. Objective.

  In order to solve the above-described problems of the prior art, the vehicle-mounted navigation device according to the present invention includes a display unit, and a storage unit that stores map data and ease-of-run map data including a rank of ease of travel of a specific road section. And, based on the map data, a control means for searching for a route from a departure place to a destination, and a route drawing means for displaying the route on a screen of the display means. The searched route is made into a band-shaped graph, the route is divided into the ranks of the ease of running, and the band-shaped graph is generated in a display mode according to the rank of the ease of running, and the route is generated. The strip-like graph is displayed on the screen of the display means on the drawing means. The ease of running map data is map data indicating the ease of running on the road created and updated by the Ministry of Land, Infrastructure, Transport and Tourism and the National Institute for Land and Infrastructure Management.

  The in-vehicle navigation device according to the above aspect changes the width and color of the band-shaped graph according to the rank, makes the band-shaped graph a length according to the distance of the route, The distance is calculated for each rank of ease and displayed together with the belt-like graph, the travel time of the route is calculated and displayed together with the belt-like graph, or the belt-like graph is displayed on the display means. Display with the displayed map image, divide the screen of the display means into two parts, display the map image on one side, display the band-like graph on the other side, and output a signal according to the operation Operating means, and when the strip-like graph is selected via the operating means, the control means is information on a road section corresponding to the selected portion based on the map data. To generate, it may be or is displayed on the screen of the display unit.

  Further, according to another aspect of the present invention, in a vehicle-mounted navigation device comprising display means and storage means for storing ease of travel map data including map data and a rank of ease of travel of a specific road section. A route display method for searching for a route to a specified destination, a step for converting the searched route into a band-shaped graph, and the searched route for each rank of ease of travel. Dividing and adding a rank of ease of travel to the link data of the classified route, a step of making the strip-like graph a display mode according to the rank of the ease of travel, and according to the rank And a step of displaying a strip-shaped graph processed into a display mode on the screen of the display means.

  Moreover, in the route display method according to this aspect, the step of setting the display mode according to the rank is a step of changing the width and color of the band-shaped graph according to the rank, or the band-shaped graph. The step includes a step of detecting a distance of the searched route and a step of setting the length according to the detected distance, or adding the rank of the ease of travel, and then the search. A step of calculating a distance for each rank of the easiness of travel in the route that is displayed, and the step of displaying the strip-shaped graph on the screen of the display means includes the step of displaying the calculated distance together with the strip-shaped graph. Or after the step of adding the rank of the ease of travel, the step of calculating the travel time of the searched route, The step of displaying the graph on the screen of the display means is a step of displaying the calculated travel time together with the band-shaped graph, or the step of displaying the band-shaped graph on the screen of the display means The step of displaying the band-shaped graph together with the map image displayed on the display means, or the step of displaying the band-shaped graph on the screen of the display means includes a step of dividing the screen of the display means into two parts, A map image may be displayed on one of the divided screens, and the band-shaped graph may be displayed on the other screen.

  According to the present invention, the searched route is formed into a band-shaped graph, and the route is classified according to the rank of the ease of travel, and the data in the display mode according to the rank of the ease of travel is generated. Then, the belt-like graph is displayed on the screen of the display means on the route drawing means. Thereby, the user can grasp | ascertain easily the ease of running of each path | route. For this reason, the user can make a selection after comparing routes from the viewpoint of ease of running. For example, if the user is not confident in driving on a narrow road, refer to the belt-like graph and select a route with a wide road section that is expected to be wide and easy to run. can do.

It is a block diagram which shows the structure of the vehicle-mounted navigation apparatus which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the process which displays the route graph to the destination performed in the control part of the vehicle-mounted navigation apparatus which concerns on this embodiment. It is a figure which shows an example of the map image by which the guidance route displayed on the screen of a display apparatus was drawn. FIG. 4A is a diagram illustrating an example of a route graph drawn on a part of a map displayed on the screen of the display device, and FIG. 4B is illustrated in FIG. It is the figure which expanded the path | route graph among images. It is a figure which shows an example of the image which expanded the area | region where the route graph is displayed on the whole screen. It is a figure which shows an example of the image of the map at the time of dividing the screen of a display apparatus into 2 and a route graph. It is a figure which shows an example of the image displayed on the screen of a display apparatus, when a user selects either of the guidance paths on a map.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing a configuration of an in-vehicle navigation device according to an embodiment of the present invention.

  In the in-vehicle navigation device 20 according to the present embodiment, reference numeral 1 denotes a DVD drive. Each DVD (DVD-ROM) 1a driven by the DVD drive 1 has each scale level (1/12500, 1/25000, 1 / Map data divided into a longitude width and a latitude width of an appropriate size in accordance with 50000). In addition to data related to various facilities existing on the map, this map data corresponds to the points where multiple roads such as intersections and branches intersect with road unit data necessary for various processes such as route search and map matching. It includes nodes (points expressed in longitude and latitude) and links corresponding to roads, lanes and the like connecting the nodes.

  In addition, the DVD 1a stores ease of travel map data including the level of ease of travel of a specific road section. This level of ease of travel is the type of road (general roads, roads dedicated to automobiles, etc.), the environment around the road (city areas, suburbs, mountains, etc.), road width (number of lanes), the size of the curve, and the number of curves The size of the slope, the presence or absence of a sidewalk, the size of the sidewalk, the size of the shoulder, and whether or not vehicles can pass each other. Each road section is classified into rank S, rank A, rank B, rank C, and rank D. In other words, this ease of travel map data indicates that the road sections of rank M and rank S are the easiest to run and the road section of rank D is the hardest to run.

  In the present embodiment, a DVD-ROM is used as a medium for storing map data, but other storage media such as a CD-ROM and HDD may be used instead.

  Reference numeral 2 denotes an operation unit for operating a navigation device body to be described later, and has, for example, a touch panel provided on the front surface of a display device to be described later. The operation unit (touch panel) 2 outputs a signal corresponding to the contact position when the user touches with a finger or the like. Instead of the touch panel, the operation unit 2 is provided with various operation buttons, a joystick, and the like for selecting various menus and various items on the screen of the display device to be described later, and for executing the selected menus and the like. You may have the form of a remote control transmitter.

  3 is a GPS receiver that receives a GPS signal sent from a GPS satellite and detects the longitude and latitude of the current position of the vehicle, 4 is an angle sensor such as a gyro for detecting the traveling direction of the vehicle, 1 shows a self-contained navigation sensor equipped with a distance sensor or the like that generates a pulse at every constant travel distance.

  5 receives a signal including traffic information (so-called VICS information) data such as traffic jam information sent in real time from a radio beacon transmitter or an optical beacon transmitter installed on the shoulder of the road on which the vehicle is traveling. A beacon receiver is shown. Reference numeral 6 denotes a communication device that is composed of, for example, a mobile phone and connects to an external information center (not shown) via the Internet and acquires data stored in the information center.

  Reference numeral 7 denotes a display device that displays a variety of information related to the in-vehicle navigation device 20 and includes a liquid crystal display (LCD) panel, an organic EL panel, and the like.

  In the navigation apparatus main body 10, reference numeral 11 denotes a buffer memory for temporarily storing map data read from the DVD 1a via the DVD drive 1 and ease-of-running map data, and 12 denotes a control unit constituted by a microcomputer or the like.

  The control unit 12 basically detects the current position of the host vehicle based on a signal output from the GPS receiver 3 or determines the traveling speed of the host vehicle based on a signal output from the self-contained navigation sensor 4. Map data to be calculated or controlled by the DVD drive 1 is read out from the DVD 1a to the buffer memory 11, and the departure point (for example, the current vehicle's current location) is set according to the search conditions set using the read map data. Various processes related to navigation such as searching for a guidance route from the position to the destination are executed.

  Further, the control unit 12 converts the searched guidance route into a band-shaped graph, reads out the ease map data from the DVD 1a to the buffer memory 11, and displays the band-shaped graph corresponding to each road section constituting the guidance route. The route graph data is generated by adding the rank of the ease of running in the corresponding road section to each part.

  Reference numeral 13 denotes a map drawing unit that performs map image drawing processing using the map data read to the buffer memory 11. Reference numeral 14 denotes an operation screen / mark generation unit that generates various menu screens (operation screens) and various marks such as a vehicle position mark and a cursor according to the operation status.

  Reference numeral 15 denotes a guide route storage unit for storing data related to the guide route. The guidance route storage unit 15 stores data related to all nodes (coordinates of points expressed in longitude and latitude) from the departure point to the destination of the guidance route searched by the control unit 12. Reference numeral 16 denotes a guidance route drawing unit. Based on the control from the control unit 12, the guidance route data is read from the guidance route storage unit 15, and the guidance route is displayed differently from other roads (for example, the color is changed). The line width is increased, etc.).

  Reference numeral 17 denotes a route graph drawing unit that draws a route graph using the route graph data generated by the control unit 12. The route graph drawing unit 17 draws a route graph in which each portion of the belt-like graph corresponding to each road section constituting the guidance route is made to have a width and color corresponding to the level of ease of travel of the corresponding road section. .

  Reference numeral 18 denotes an image composition unit. Based on the control from the control unit 12, the map image drawn by the map drawing unit 13 is displayed on the guide route drawn by the guide route drawing unit 16 and the operation screen / mark generation unit 14. The generated various menu screens and various marks, the route graph drawn by the route graph drawing unit 17 and the like are superimposed and displayed on the screen of the display device 7.

  Reference numeral 19 denotes an audio output unit which outputs an audio signal (for example, guidance information related to navigation) to the speaker 8 based on control from the control unit 12.

  Hereinafter, with respect to the process of displaying the route graph to the destination performed in the control unit 12 of the in-vehicle navigation device 20 according to the present embodiment, the display examples of FIGS. The description will be given with reference. It is assumed that a route that has the shortest travel distance (distance priority), a route that has the shortest travel time (time priority), and a recommended route are designated as the search conditions for the guidance route. Further, it is assumed that the vehicle-mounted navigation device 20 is turned on, and a map image around the current position of the vehicle and the vehicle position mark are displayed on the screen of the display device 7.

  In the first step S11, it is determined whether the destination is set by the user (YES) or not (NO). When the user sets the destination via the operation unit 2, the determination is YES, and the process proceeds to step S12.

  In the next step S12, a guidance route from the departure point (the current position of the vehicle) to the destination is searched under the search conditions specified by the user. That is, a distance priority route, a required time priority route, and a recommended route are searched. Then, a distance, a required time, and a toll are calculated for each of the searched plurality of guide routes. In the present embodiment, the recommended route is a route that prioritizes national roads and prefectural roads.

  In the next step S13, based on the control from the control unit 12, the guidance route drawing unit 16 draws the searched guidance route, and the image composition unit 18 superimposes the guidance route on the map image to display the image. Is displayed on the screen of the display device 7.

  FIG. 3 is a diagram illustrating an example of a map image on which a guidance route displayed on the screen of the display device 7 is drawn. As shown in FIG. 3, a plurality of guide routes 31 to 33 are drawn on the map with a thicker line width than other roads. In addition, the guide paths 31 to 33 are displayed in different colors. In FIG. 3, the difference between the respective guidance routes is represented by the difference in the line type.

  In the next step S14, the ease map data corresponding to all sections of the guide route is read from the DVD 1a to the buffer memory 11 to obtain the data. That is, the travel ease map data corresponding to each of the distance priority route, the required time priority route, and the recommended route is acquired.

  In the next step S15, for each guidance route, the rank of ease of travel is added to each road section constituting the guidance route based on the acquired ease map data. Each guide route is represented by link data connecting predetermined nodes. The data of the ease of travel map is attached with rank information (rank A, rank B, etc.) indicating ease of travel for each predetermined section of the road. A road corresponding to the guide route is searched from the ease map database, and if rank information indicating the ease of travel is added to the corresponding road, the rank information is added to the link data of the guide route. After adding a rank indicating ease of running for each guidance route, a distance for each rank of ease of running is calculated.

  In the next step S16, each guide route is converted into a strip graph having a length corresponding to the distance for each rank calculated in step S15.

  In the next step S17, based on the control from the control unit 12, the route graph drawing unit 17 converts each portion of the band graph corresponding to each road section of the guidance route to the guidance route for the band graph representing each guidance route. A route graph expressed in width and color according to the rank of the added ease of running is drawn. And about the route graph showing each guidance route, the distance of a guidance route, the required time, the toll, and the distance of the road section according to rank of ease of travel are drawn in the neighborhood of a route graph.

  In the next step S18, based on the control from the control unit 12, the image composition unit 18 superimposes a route graph representing each guidance route on a part of the map image on which the guidance route is drawn, and displays the screen of the display device 7. To display.

  FIG. 4A is a diagram showing an example of a route graph drawn on a part of the map displayed on the screen of the display device 7, and FIG. 4B is shown in FIG. It is the figure which expanded the route graph among the obtained images. As shown in FIG. 4A, route graphs 41 to 43 representing a recommended route, a distance priority route, and a time priority route are displayed at the bottom of the screen on which the map is displayed. Above each of the route graphs 41 to 43, the required time, toll and distance of the guide route represented by each route graph, and the distance of the road section by rank of ease of travel are displayed. Each of the route graphs 41 to 43 has a length corresponding to the distance of the corresponding guidance route. 4A and 4B, among the recommended route, the distance priority route, and the time priority route, the route graph 42 of the distance priority route is shorter than the route graph 41 of the recommended route, and the route of the time priority route. The graph 43 is longer than the route graph 41 of the recommended route.

  The guide routes 31 to 33 and the route graphs 41 to 43 displayed on the map correspond one-to-one. The color of the corresponding guidance route may be displayed at the head of each of the route graphs 41 to 43 so that this correspondence relationship becomes clear.

  Among the route graphs 41 to 43, for example, a route graph 41 representing a recommended route is displayed in the order of a rank A portion, a rank B portion, a rank C portion, and a rank B portion from the left side. This indicates that the distance from the starting point to the destination is composed of a rank A road section, a rank B road section, a rank C road section, and a rank B road section. Each part of the route graphs 41 to 43 has a length corresponding to the distance of the road section of the corresponding guide route. Furthermore, each part of the route graphs 41 to 43 is displayed with a width and a color according to the level of ease of travel of the road section of the corresponding guide route. In FIG. 4, the color difference of each part of the path graphs 41 to 43 is represented by the difference in the type of hatching.

  Further, as shown in FIG. 4A, a display enlargement button 44 is arranged at the lower left portion of the area where the route graphs 41 to 43 at the lower portion of the map are displayed, and a display erase button 45 is arranged at the lower right portion. Has been placed. The display enlargement button 44 is a button for instructing to enlarge the area in which the route graphs 41 to 43 are displayed on the entire screen, and the display deletion button 45 is to delete the area in which the route graph is displayed. Button for instructing to display only the map image.

  When the display enlargement button 44 is selected, the route graphs 41 to 43 are enlarged and displayed. FIG. 5 shows a display example in which the area where the path graphs 41 to 43 are displayed is enlarged to the entire screen. In the state where the route graph is displayed at the bottom of the map screen, it is possible to grasp the outline of the ease of running, but by expanding and displaying the route graphs 41 to 43 as shown in FIG. Detailed information such as the number of distances can be easily obtained. As shown in FIG. 5, a display reduction button 46 is arranged at the lower left portion of the screen, and a display deletion button 45 is arranged at the lower right portion. The display reduction button 46 is a button for instructing to reduce the area in which the route graphs 41 to 43 are displayed and to return to the previous state (the state displayed in the lower part on the map).

  As described above, according to the vehicle-mounted navigation device 20 according to the present embodiment, the searched guide routes 31 to 33 are converted into a strip graph, and each portion of the strip graph corresponding to each road section of the guide route is converted. The route graphs 41 to 43 are displayed in widths and colors according to the rank of ease of travel. Thereby, the user can grasp | ascertain easily the ease of running of each guidance path | route 31-33. For this reason, the user can select after comparing the guide paths 31 to 33 from the viewpoint of ease of travel. For example, when the user is not confident in traveling on a narrow road, referring to the route graphs 41 to 43, the road section of rank A that is expected to be wide and easy to travel is long. The time priority path 33 can be selected.

  Moreover, the distance of the road section according to rank of the easiness of driving | running | working of the guidance routes 31-33 is displayed on the vicinity of the route graphs 41-43. Thereby, the user can grasp | ascertain the distance of the road segment according to rank of easiness of driving | running | working sensuously by the length of the part of the route graphs 41-43, and can grasp | ascertain it as a numerical value.

  In the above-described embodiment, when the user selects any of the portions of the route graphs 41 to 43, the details of the road sections of the guidance routes 31 to 33 corresponding to the selected portion based on the map data. A map is displayed or a satellite photograph image of the road section of the guide routes 31 to 33 corresponding to the selected portion is displayed based on data acquired from an external information center (not shown) via the communication device 6. You may make it. Thereby, the user can know the detailed information of the road section corresponding to the selected portion, that is, the information on the basis of the level of ease of travel such as the width of the road, the size of the curve, etc. It becomes a judgment material when selecting any of -33. In this case, the scale of the detailed map and the range of the satellite photograph image may be changed according to the level of ease of travel of the selected road section. For example, when the level of ease of travel of the selected road section is rank D, a detailed map with a small scale (or a satellite photograph image with a narrow range) is displayed, and the level of ease of travel is higher than that. In the case of the rank, a detailed map (or a satellite photograph image with a wide range) having a larger scale may be displayed.

  Further, in the above-described embodiment, the route graphs 41 to 43 are displayed on a part of the map image, but the screen of the display device 7 is divided into two, the map image is displayed on one side, and the other A route graph may be displayed on the screen. FIG. 6 is a diagram illustrating an example of a map and a route graph image when the screen of the display device 7 is divided into two. As shown in FIG. 6, a map image is displayed on the left part of the screen of the display device 7, and route graphs 41 to 43 are displayed on the right part.

  In addition, when the user selects any one of the guide routes 31 to 33 via the operation unit 2, only the route graph representing the selected guide route may be displayed. FIG. 7 is a diagram illustrating an example of an image displayed on the screen of the display device 7 when the user selects any one of the guide routes on the map. For example, if the user selects the recommended route 31 when the image shown in FIG. 3 is displayed, only the route graph 41 representing the recommended route 31 is displayed at the bottom of the map as shown in FIG. The Thereby, the user can know clearly the ease of running of a desired guidance route first. And the user can compare the easiness of driving | running | working of the guidance routes 31-33 by selecting another guidance route.

  In the above-described embodiment, the recommended route is searched based on the map data. However, the recommended route may be searched based on the map data and the driving ease map data. When searching for a recommended route based only on map data, for example, a value obtained by multiplying the distance by a coefficient according to the road type, the number of lanes, the width, the presence or absence of a sidewalk, etc. is calculated as a cost. The smallest route is the recommended route. On the other hand, when a recommended route is searched based on map data and ease-of-run map data, for example, a road to which the map of easy-to-run maps is added is easy to run for each rank of ease of travel. A value obtained by multiplying the distance of the road section corresponding to the rank by a coefficient corresponding to the rank of the ease of travel and the number of lanes is calculated, and a value obtained by adding the values is calculated as a cost. Next, the cost is calculated using only the map data for roads to which the ease map data is not added. Then, the total cost for each route is calculated from these costs, and the smallest one of the calculated costs is set as a recommended route. Thus, by displaying the recommended route searched in consideration of the ease of travel map data, it is possible to widen the selection range of the user's guidance route.

  In the above-described embodiment, the route graph of the guidance route including only the road section to which the rank information of the ease of travel is added is displayed, but the road section to which the rank information of the ease of travel is not added. It is also possible to display a guidance route including In this case, the road graph to which the rank information is not added is displayed in a different manner from the road to which the rank information is added.

1a ... DVD-ROM (storage means),
2 ... operation part (operation means),
7: Display device (display means),
10: Car navigation device body,
12 ... Control part (control means),
17: Route graph drawing unit (route drawing means),
20 ... In-vehicle navigation device,
31-33 ... guidance route,
41-43 ... route graph (band-shaped graph).

Claims (24)

Display means;
Storage means for storing map data and ease of travel map data including a rank of ease of travel of a specific road section;
Control means for searching for a route from the starting point to the destination based on the map data;
Route drawing means for displaying the route on the screen of the display means;
Have
The control means converts the searched route into a band-like graph, classifies the route according to the rank of the runnability, and displays the band-like graph in a display mode according to the rank of the runnability. A vehicle-mounted navigation device, wherein the route drawing unit displays the band-shaped graph on the screen of the display unit.   The in-vehicle navigation device according to claim 1, wherein the control unit changes a width and a color of the band-shaped graph according to the rank.   The in-vehicle navigation device according to claim 2, wherein the control unit makes the strip-like graph a length corresponding to the distance of the route.   The in-vehicle navigation device according to claim 3, wherein the control unit calculates a distance for each rank of the ease of travel on the route and displays the distance together with the belt-like graph.   The in-vehicle navigation device according to claim 4, wherein the control unit calculates a required travel time of the route and displays the calculated time together with the belt-like graph.   The in-vehicle navigation device according to claim 1, wherein the control unit displays the band-shaped graph together with a map image displayed on the display unit.   The in-vehicle navigation device according to claim 1, wherein the control unit divides the screen of the display unit into two, displays a map image on one side, and displays the belt-like graph on the other side. Furthermore, an operation means for outputting a signal corresponding to the operation is provided,
When the strip-like graph is selected via the operation means, the control means generates information on a road section corresponding to the selected portion based on the map data, and displays the information on the screen of the display means. The in-vehicle navigation device according to claim 6 or 7, wherein the on-vehicle navigation device is displayed.   The rank of the ease of travel is the road type, the environment around the road, the road width, the size of the curve, the number of curves, the size of the gradient, the presence or absence of the sidewalk, the size of the sidewalk, the size of the shoulder, and The in-vehicle navigation device according to claim 1, wherein the in-vehicle navigation device is set based on whether or not the vehicle passes.   The in-vehicle navigation system according to claim 1, wherein the control unit searches for a route having the shortest travel distance, a route having a minimum travel time, and a recommended route based on the map data. apparatus.   The control means searches for a route with the shortest travel distance, a route with a minimum travel time, and a recommended route based on the map data and the ease of travel map data. The vehicle-mounted navigation device according to 1.   The control means is a mode in which a portion of the road section to which the runability rank of the belt-like graph of the route is added and a portion of the road section to which the runability rank is not added are different from each other. The vehicle-mounted navigation device according to claim 11, wherein the vehicle-mounted navigation device is displayed. A route display method performed in an in-vehicle navigation device comprising display means and storage means for storing ease map data including map data and a rank of ease of travel of a specific road section,
Searching for a route to a specified destination;
Making the searched route a band-like graph;
Dividing the searched route for each rank of ease of running, and adding a rank of ease of running to the link data of the classified route;
Making the strip-shaped graph a display mode according to the rank of the ease of running;
Displaying a band-shaped graph processed into a display mode according to the rank on the screen of the display means;
A route display method characterized by comprising:   The route display method according to claim 13, wherein the step of changing the display mode according to the rank is a step of changing a width and a color of the band-shaped graph according to the rank. The step of making the band-shaped graph includes
Detecting a distance of the searched route;
Making the length according to the detected distance;
The route display method according to claim 14, further comprising: After the step of adding the runnability rank,
Calculating a distance for each rank of the ease of travel in the searched route,
16. The route display method according to claim 15, wherein the step of displaying the strip-shaped graph on the screen of the display means is a step of displaying the calculated distance together with the strip-shaped graph. After the step of adding the runnability rank,
Calculating a travel time of the searched route,
17. The route display method according to claim 16, wherein the step of displaying the belt-like graph on the screen of the display means is a step of displaying the calculated required travel time together with the belt-like graph. The step of displaying the band-like graph on the screen of the display means includes:
14. The route display method according to claim 13, wherein the route-like graph is displayed together with the map image displayed on the display means. The step of displaying the band-like graph on the screen of the display means includes:
Dividing the screen of the display means into two parts;
Displaying a map image on one of the divided screens and displaying the strip-shaped graph on the other screen; and
The route display method according to claim 13, further comprising: And detecting that the strip graph has been selected;
Obtaining information of the road section corresponding to the selected portion from the map data;
Displaying the acquired road section information on the screen of the display means;
The route display method according to claim 13, further comprising:   The rank of the ease of travel is the road type, the environment around the road, the road width, the size of the curve, the number of curves, the size of the gradient, the presence or absence of the sidewalk, the size of the sidewalk, the size of the shoulder, and The route display method according to claim 13, wherein the route display method is set based on whether or not vehicles pass each other. The step of searching for a route to the designated destination is a step of searching based on the map data,
The route display method according to claim 13, wherein the searched route is a route having a shortest travel distance, a route having a minimum travel time, and a recommended route. The step of searching for a route to the designated destination is a step of searching based on the map data and the driving ease map data,
The route display method according to claim 13, wherein the searched route is a route having a shortest travel distance, a route having a minimum travel time, and a recommended route.   In the step of changing the display mode according to the rank, the display mode of the strip-shaped graph of the route includes a portion of a road section to which the runnability rank is added and the runnability rank. 24. The route display method according to claim 23, wherein the route display method is a step of making each of different road sections different from each other.

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