JP2005077300A - Navigation device, navigation method, its program, and recording medium having program recorded therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation device, a navigation method, its program, and a recoding medium having the program recorded therein capable of solving questions held by a user, and providing a comfortable operation environment. <P>SOLUTION: In this navigation device 10 for searching for a route to the inputted destination, a control part 17 calculates cost of each route searched for. As items of the cost, for example, 'road attribute cost', 'road width cost', 'cost for the number of lanes', 'branch cost', 'signal cost' and 'distance cost' are enumerated. The control part 17 calculates the cost for the items in each route, and stores it in a cost detailed table. Then, the total value (total cost) of the cost in each route is compared, and a guidance route is determined based on the result, and the cost for each item is compared, and a superior point of the guidance route is specified. Thereafter, a route selection reason is generated on the basis of the specified superior point, and the result is displayed on a display part 7 through a display information generation part 19 and an image composition part 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a navigation device, a navigation method, a program thereof, and a recording medium on which the program is recorded, and particularly relates to a navigation device suitable for in-vehicle use, a navigation method, a program thereof, and a recording medium on which the program is recorded.

  Conventionally, a conventional typical vehicle-mounted navigation device includes a CD (Compact Disk) -ROM (Read Only Memory), a DVD (Digital Versatile Disk) -ROM, an IC (Integrated Circuit) memory card, etc. in which map data is stored in advance. Map data storage device, display device, GPS (Global Positioning System) receiver, gyroscope, vehicle speed sensor and other sensors for detecting the current position and traveling direction of the vehicle, and map data around the current position of the vehicle Is read out from the map data storage device, a map image is displayed on the display screen based on the map data, and a vehicle position mark (own vehicle mark) is superimposed and displayed at a predetermined location on the map image. In this display, as the current position changes according to the movement of the vehicle, the map image is fixed on the screen and the vehicle position mark is moved, or the vehicle position mark is fixed at a predetermined position such as the center of the screen. By displaying the map image in a scrolling manner, it is always possible to see at a glance where the vehicle is currently running.

  In such a navigation device, when a user (for example, a driver) sets a destination, the navigation route is searched for from the departure point to the destination using map data, and the guidance route is displayed on the display screen. A function (route guidance function) for driving guidance of the driver is installed. Usually, the navigation device as described above is configured to select several routes from among several candidates when determining a guidance route, and to select a route that seems to be optimal.

When the navigation device selects a guide route from candidates, the navigation device selects which one to optimize based on the user's preferences registered in advance, road conditions such as traffic congestion and construction. At this time, for example, if the guidance route detours to the destination, the user may be wondering why. In order to solve such a problem, there is a conventional technique configured to display to the user the reason related to the detouring section (see, for example, Patent Document 1).
JP 2003-172628 A

  However, the situation in which the user has a question about the guidance route is not limited to the case where a detour route is selected, and regardless of which route is determined, the user says “why the route is determined”. There may be doubts.

  Accordingly, the present invention has been made in view of the above problems, and realizes a navigation device, a navigation method, a program thereof, and a recording medium on which the program is recorded, which can solve a question of a user and provide a comfortable driving environment. The purpose is to do.

  In order to achieve such an object, the present invention provides a navigation device for searching for a route to an input destination, cost calculating means for calculating a cost for each searched route, and the search based on the cost. A guide route determining means for determining any one of the selected routes as a guide route, a route selection reason generating means for generating a route selection reason for the guide route based on the cost, and displaying the route selection reason together with the guide route. And display means. By generating a route selection reason indicating the reason why the guide route is selected and displaying it to the user, the user can easily know why the above route (guide route) has been selected. Can solve the questions and provide a comfortable driving environment.

  The cost calculation means calculates a cost for each item including at least one of road attribute cost, road width cost, lane number cost, branch cost, traffic light cost and distance cost, and a total value of the cost for each item. The guidance route determination means determines the guidance route based on the result of comparing the total cost values for each item, and the route selection reason generation means determines the result of comparison of the cost for each item. The route selection reason may be generated. Based on the comparison result of the total value including at least one item among the road attribute cost, road width cost, lane number cost, branching cost, traffic light cost, and distance cost, the guidance route can be determined accurately. At this time, by comparing at least one of these items, it is possible to generate a route selection reason easily and accurately based on the comparison result.

  The cost calculation means may be configured to calculate the cost for each searched route by excluding the cost related to the expressway. When a highway is preferentially searched, the highway to be used is limited and is substantially the same section. For this reason, by excluding the cost related to the expressway from the target, it is possible to determine the guidance route more accurately and generate a more accurate route selection reason.

  Further, the present invention provides a navigation method for searching for a route to an input destination, a cost calculating step for calculating a cost for each searched route, and any one of the searched routes based on the cost. A guide route determination step for determining a guide route and a route selection reason generation step for generating a route selection reason for the guide route based on the cost are configured. By generating a route selection reason indicating the reason why the guide route is selected, it becomes possible to provide the user with the reason why the above route (guide route) is selected, and the user can easily explain the reason. An environment where you can know Thereby, the user can solve the question and can drive in a comfortable environment.

  The cost calculating step calculates a cost for each item including at least one of road attribute cost, road width cost, lane number cost, branching cost, traffic light cost and distance cost, and a total value of the cost for each item. The guide route determining step determines the guide route based on a result of comparing the total cost values for each item, and the route selection reason generating step is based on the result of comparing the cost for each item. The route selection reason may be generated. Based on the comparison result of the total value including at least one item among the road attribute cost, road width cost, lane number cost, branching cost, traffic light cost, and distance cost, the guidance route can be determined accurately. At this time, by comparing at least one of these items, it is possible to generate a route selection reason easily and accurately based on the comparison result.

  The cost calculating step may be configured to calculate the cost for each searched route by excluding the cost related to the expressway. When a highway is preferentially searched, the highway to be used is limited and is substantially the same section. For this reason, by excluding the cost related to the expressway from the target, it is possible to determine the guidance route more accurately and generate a more accurate route selection reason.

  In addition, the present invention is a program for causing a computer included in a navigation device that searches for a route to an input destination to function, the cost calculation processing for calculating the cost for each searched route, and the cost And a route selection reason generation process for generating a route selection reason for the guidance route based on the cost and a function for determining one of the searched routes as a guidance route. Is done. By generating a route selection reason indicating the reason why the guide route is selected, it becomes possible to provide the user with the reason why the above route (guide route) is selected, and the user can easily explain the reason. An environment where you can know Thereby, the user can solve the question and can drive in a comfortable environment.

  The cost calculation process calculates a cost for each item including at least one of a road attribute cost, a road width cost, a lane number cost, a branching cost, a traffic light cost, and a distance cost, and a total value of the cost for each item. The guide route determination process determines the guide route based on a result of comparing the total cost of each item, and the route selection reason generation process is based on a result of comparing the cost of each item. The route selection reason may be generated. Based on the comparison result of the total value including at least one item among the road attribute cost, road width cost, lane number cost, branching cost, traffic light cost, and distance cost, the guidance route can be determined accurately. At this time, by comparing at least one of these items, it is possible to generate a route selection reason easily and accurately based on the comparison result.

  The cost calculation process may be configured to calculate a cost for each searched route by excluding a cost related to a highway. When a highway is preferentially searched, the highway to be used is limited and is substantially the same section. For this reason, by excluding the cost related to the expressway from the target, it is possible to determine the guidance route more accurately and generate a more accurate route selection reason.

  Further, the present invention is a recording medium on which the above program is recorded. By recording the above program on a recording medium, it can be widely distributed.

  An object of the present invention is to realize a navigation device, a navigation method, a program thereof, and a recording medium on which the program is recorded, which can solve a question of a user and provide a comfortable driving environment.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  First, Embodiment 1 according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an overall configuration of a navigation device (particularly a vehicle-mounted navigation device) 10 according to the present embodiment.

  In FIG. 1, a reading mechanism 1 is configured to read a recording medium such as a CD (Compact Disk) -ROM (Read Only Memory) or a DVD (Digital Versatile Disk) -ROM storing map data and other guidance data. . The map data stored in the recording medium is divided into longitude and latitude widths of appropriate sizes according to each scale level (for example, 1/5000, 1/1500, 1 / 50,000, 1/100000). In addition, roads (road data), various landmarks (also referred to as properties), etc. included in this map data are represented by a coordinate set of points (nodes) expressed in latitude and longitude.

  The operation unit 2 is configured for a user to input various operations and settings to the navigation device 10. This may be configured individually, such as a remote controller device or a control panel, or may be configured as a touch panel type input device integrally with a display unit 7 described later. Furthermore, it may be constituted by a microphone for voice input. The transmission / reception unit 3 is configured by an in-vehicle telephone for communicating with various service centers. The VICS (road traffic information communication system) receiving unit 4 is configured to receive VICS information transmitted from a radio wave beacon or an optical beacon. The GPS (Global Positioning System) receiving unit 5 is configured to receive a GPS signal transmitted from a GPS satellite and detect the latitude and longitude of the current position of the vehicle. The self-contained navigation sensor 6 includes an angle sensor 6a including a gyro for detecting the vehicle direction, and a distance sensor 6b that generates a pulse for every predetermined travel distance. Detect speed.

  The display unit 7 is configured by, for example, a liquid crystal display type display device or the like, and displays various information such as a map, a guidance route, a current position of a vehicle, and other landmarks input from the navigation device 10 on the screen. It is a configuration. The guidance route is a route to the destination that is actually provided to the user, and is a route that is superimposed on the map image on the display unit 7.

  Similarly, the speaker 8 is configured to output voice guidance information and the like input from the navigation device 10. In addition, the speaker 8 can also output music input from an audio device or the like.

  In the navigation device 10, the buffer memory 11 is configured to temporarily store map data and the like input from the reading mechanism 1 under the control of the control unit 17 described later. I / F (interfaces) 12, 13, 14, 15 and 16 connect the operation unit 2, the transmission / reception unit 3, the VICS reception unit 4, the GPS reception unit 5 and the self-contained navigation sensor 6 to the internal bus in the navigation device 10, respectively. It is the structure for doing.

  The control part 17 is comprised by arithmetic processing apparatuses, such as a microcomputer and CPU (central processing unit), for example. The control unit 17 has a built-in navigation program (a program for performing a route search process to be described later and a display output control necessary for route guidance based on the program). According to this program, the GPS receiver 5 and Based on the signal output from the self-contained navigation sensor 6, the current position of the vehicle is detected, the map data to be displayed is read from the reading mechanism 1 to the buffer memory 11, or the map data read to the buffer memory 11. Various processings related to navigation such as searching for a guidance route from a starting point or a current position (hereinafter referred to as a current position) to a destination under a search condition set using the above are executed. However, for example, the above-mentioned program is stored in a CD-ROM, a DVD-ROM, or the like, and the control unit 17 may be configured to read and execute it as necessary.

  The map drawing unit 18 is configured to perform a map image drawing process using the map data read to the buffer memory 11. The display information generation unit 19 draws various menu screens (operation screens) and various marks such as a vehicle position mark and a cursor according to the operation status, and the guidance route is determined based on information input from the control unit 17. This is a configuration for drawing the reason (hereinafter referred to as a “roud selection reason”) on the display unit 7. The guide route storage unit 20 stores data on all nodes of the guide route searched for in the control unit 17 based on the current position, the destination, and other search conditions, and data of guide routes changed during the search (hereinafter, these Is referred to as guidance route data). The guide route drawing unit 21 is configured to read the guide route data from the guide route storage unit 20 and draw the guide route in a display mode (highlighted display using colors and line widths) different from other roads. . The icon drawing unit 22 is configured to perform an icon drawing process for instructing each landmark corresponding to each landmark data (also referred to as property data) included in the map data. In the present embodiment, the icon drawing unit 22 may be configured to perform drawing processing on all the property data existing on the map data read out to the buffer memory 11 or searched. The drawing process may be executed only for the property data that satisfies a predetermined condition (for example, located within 50 m along the guide route) with respect to the guide route. The audio output unit 23 includes, for example, a DSP (Digital Signal Processor) and the like, and outputs an audio signal to the speaker 8 based on a signal from the control unit 17.

  The image compositing unit 24 adds the guidance route drawn by the guidance route drawing unit 21 to the map image drawn by the map drawing unit 18, the operation screen drawn by the display information generation unit 19, various marks and the route selection reason, In this configuration, icons or the like indicating each landmark drawn by the icon drawing unit 22 are appropriately overlapped and displayed on the display unit 7.

  In the above configuration, during navigation, a display screen as shown in FIG. As shown in FIG. 2, the guide screen and the route selection reason are displayed on the map image on the display screen. The route selection reason may be switched between display and non-display by the user using a “route selection reason display” button in the display screen.

  Next, the operation when the control unit 17 generates the guide route and the route selection reason will be described in detail with reference to the drawings.

  When the navigation device 10 is activated, first, as shown in FIG. 3, the control unit 17 acquires the current position of the host vehicle based on the GPS signal received from the GPS receiving unit 5 (step S101). Next, when the destination is set by the user using the operation unit 2 and the display unit 7 (step S102), the control unit 17 reads the map data from the reading mechanism 1 based on the current position and the destination, A route search process for searching for a route (also referred to as a route) to the destination is executed (step S103). In step S103, the control unit 17 searches for a plurality of routes.

  Here, the operation of the control unit 17 when searching for a route will be described below. The control unit 17 searches for a route from the current position to the destination by sequentially connecting nodes such as intersections such as intersections, expressways, and toll roads in the route search processing in step S103. At this time, there are one or more candidates for the next node (this is called the next node) for a certain node (this is called the current node). Therefore, the control unit 17 relates to the road to the next node such as its attributes (road attribute: national road, prefectural road, general road, expressway, toll road, overpass, etc.), road width, number of lanes, number of traffic lights, distance, etc. Get information. Coefficients are set in advance for road attributes, road widths, the number of lanes, the number of traffic lights, distances, and the like according to the degree. The control unit 17 multiplies the acquired information by the above coefficient, and determines the next node based on this value (cost to the next node). Further, the cost to the next selected node is stored in a predetermined memory such as the buffer memory 11. Note that the cost is a numerical value of the appropriate degree as a guide route, and is set for each item such as the road attribute, the road width, the number of lanes, the number of traffic lights, the distance, and the like.

  Next, the control part 17 calculates the cost regarding all the searched routes, and performs the cost comparison process which compares these (step S104). Details of the cost comparison processing will be described in detail with reference to FIGS. FIG. 4 is a flowchart showing the operation procedure of the cost comparison process. FIG. 5 is a diagram illustrating a cost detail table generated in the cost comparison process. The cost detail table stores the total cost for each searched route and the detailed cost for each item.

  As shown in FIG. 4, in the cost comparison process (S104), the control unit 17 first acquires the number Nmax of routes searched in step S103 (step S201). The path searched in step S103 is stored in the storage means such as the buffer memory 11, and the control unit 17 refers to this to obtain the number Nmax.

  Next, the control unit 17 substitutes 1 for the variable N (step S202), and calculates the cost of the Nth (herein, first) route (hereinafter referred to as the first route) for each item (step S203). ). As the cost items, as shown in FIG. 5, for example, “road attribute cost”, “road width cost”, “lane number cost”, “branch cost”, “traffic light cost”, “distance cost”, etc. is there. The cost for each item is calculated based on the cost up to the next node stored in the memory such as the buffer memory 11 in step S103 described above. In FIG. 5, each item has a lower cost value. That is, the route is easy for the user to drive.

  When the cost for each item is calculated as described above, the control unit 17 then adds these costs and calculates the total cost (see FIG. 5) in step S204 of FIG. Steps S203 and S204 are referred to as a cost calculation step or a cost calculation process. This is also a cost calculation means realized in the control unit 17. The cost for each item and the total cost calculated as described above are stored in a cost detail table generated in the buffer memory 11, for example.

  When the cost and total cost for each item regarding the Nth route are calculated in this way, the control unit 17 next determines whether or not N is Nmax (step S205). If the calculation of the cost for each item and the total cost for the route has not been completed (No in Step S207), the control unit 17 increments N by 1 (Step S206) and returns to Step S203.

  If N = Nmax as a result of the determination in step S205, that is, if calculation of the cost and total cost for each item is completed for all routes (Yes in step S207), the control unit 17 then proceeds to FIG. A guidance route is determined based on the cost detail table prepared as described above (step S208). In this step, for example, a guidance route is determined by selecting a route having the smallest total cost. Accordingly, for example, in the example illustrated in FIG. 5, the first route is determined as the guidance route. Step S208 is referred to as a guidance route determination step or a guidance route determination process. This is also guidance route determination means realized in the control unit 17.

  Further, the control unit 17 compares the determined cost of the guidance route with the cost of the other route for each item, and identifies which item regarding the guidance route is most advantageous compared to the other route. (Step S209). In this description, an item having the most advantage over other routes is regarded as an advantage.

  Thereafter, the control unit 17 generates a route selection reason from a comment registered in advance based on the identified superiority (step S210). The reason for selecting the route is a comment for easily explaining to the user why the displayed guide route is determined. Therefore, it is preferable that the description is easy to understand using general expressions. Therefore, it is preferable to generate the following route selection reason based on the advantages identified.

  For example, when the item of “road attribute cost” is an advantage, the control unit 17 selects “a route that passes through the main road compared with other candidate routes. ”Is generated. When the item of “road width cost” is an advantage, the control unit 17 selects “a route with a wider road width than other candidate routes. ”Is generated. When the “lane cost” is a factor, the control unit 17 says, “A route with more lanes than other candidate routes has been selected. ”Is generated. When the “branch cost” is a factor, the control unit 17 “selects a route with fewer right and left turns than other candidate routes. ”Is generated. When the “traffic signal cost” is a factor, the control unit 17 “selects a route with fewer traffic lights compared to other candidate routes. ”Is generated. When “distance cost” becomes a factor, the control unit 17 “selects a route with a shorter distance than other candidate routes. ”Is generated.

  By displaying the reason for route selection to the user using general expressions as described above, the user can easily know the reason why the guidance route is selected. In addition, said step S209 and step S210 are called a route selection reason generation step or a route selection reason generation process. This is also a route selection reason generation means realized in the control unit 17.

  When the guidance route and the route selection reason are generated as described above, the control unit 17 proceeds to step S105 in FIG. 4 and outputs the generated guidance route and route selection reason to the display information generation unit 19. Thus, the generated guidance route and route selection reason are drawn in the display information generation unit 19 and displayed on the display unit 7 via the image synthesis unit 24 (see FIG. 2).

  In the above configuration, the route selection reason is displayed when the guidance route is displayed. However, for example, when the guidance route is displayed, the route selection reason may be reproduced by voice. Thereby, a route selection reason can be provided to the user without disturbing driving.

  The operation of the control unit 17 described above is realized, for example, when the control unit 17 reads a program for realizing this from a predetermined recording device, for example, the reading mechanism 1 and executes the program. Further, by recording this program on a recording medium, it can be widely distributed.

  Next, a second embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Further, the configuration not specifically mentioned is the same as that of the first embodiment.

  For example, when a route search is performed with priority on the expressway, the area of the expressway generally used is from the interchange closest to the current position to the interchange closest to the destination. In this embodiment, therefore, the cost of each item related to the expressway is not taken into account when searching for a route. As a result, route search can be performed more quickly, and the reason for route selection can be determined more accurately.

  Since the configuration of the navigation device according to the present embodiment is the same as that of the navigation device 10 according to the first embodiment, detailed description thereof is omitted here.

  Next, the operation when the control unit 17 in the present embodiment determines the guidance route and the operation when the route selection reason is generated will be described in detail with reference to the drawings.

  The operation when the operation of the control unit 17 according to the present embodiment generates the guidance route and the route selection reason is substantially the same as the operation shown in FIGS. 4 and 5 described above. However, the operations in steps S203 and S204 in FIG. 4 are replaced by steps S301 to S304 shown in FIG. Furthermore, the operations from step S207 to S210 in FIG. 4 are replaced with steps S310 to S317 shown in FIG.

  That is, in the cost comparison process, the number Nmax of searched routes is acquired (step S201), and 1 is substituted for N (step S202). Then, as shown in FIG. The cost of the route from the current position to the expressway entrance is calculated for each item (step S301), and the total cost from the current position of the route to the expressway entrance is calculated (step S302). The control unit 17 calculates the cost from the expressway exit to the destination on the Nth route for each item (step S303), and calculates the total cost from the expressway exit to the destination on this route. (Step S304).

  Thereafter, when the above process is completed for all the routes (Yes in step S205), the control unit 17 then proceeds to the process shown in FIG. In FIG. 7, the control unit 17 first compares the total cost from the current position to the expressway entrance (step S310) to determine a guide route from the current position to the expressway entrance (step S311). Thereafter, the control unit 17 identifies the advantage of this section based on the cost for each item from the current position to the expressway entrance (step S312), and the reason for selecting the route from the current position to the expressway entrance. Generate (step S313).

  Next, the control unit 17 compares the total cost from the expressway exit to the destination (step S314) to determine the guide route from the expressway exit to the destination (step S315). Thereafter, the control unit 17 identifies the advantage of this section based on the cost for each item from the expressway exit to the destination (step S316), and determines the route selection reason from the expressway exit to the destination. Generate (step S317).

  When the guidance route and the route selection reason are generated as described above, the control unit 17 proceeds to step S105 in FIG. 4 and outputs the generated guidance route and route selection reason to the display information generation unit 19. Thereby, the generated guidance route and route selection reason are drawn in the display information generation unit 19 and displayed on the display unit 7 via the image synthesis unit 24. The display screen at this time is shown in FIG. As shown in FIG. 8, the display unit 7 displays the route selection reason for the guidance route from the current position to the expressway entrance and the route selection reason for the route from the expressway exit to the destination. Thereby, the user can know a more accurate reason.

  In addition, the said Example 1 and Example 2 are only the examples for implementing this invention, This invention is not limited to these, Various deformation | transformation of these Examples is in the range of this invention. It is obvious from the above description that various other embodiments are possible within the scope of the present invention.

It is a block diagram which shows the structure of the navigation apparatus 10 by Example 1 of this invention. It is a figure which shows an example of the display screen displayed on the display part in Example 1 of this invention. It is a flowchart which shows the operation | movement at the time of the control part 17 producing | generating a guidance route and a route selection reason in Example 1 of this invention. It is a flowchart which shows the operation | movement procedure of the cost comparison process shown to step S104 of FIG. It is a figure which shows the cost detailed table produced | generated in the cost comparison process shown in FIG. FIG. 6 is a flowchart showing a part of an operation when the control unit 17 generates a guidance route and a route selection reason in the second embodiment of the present invention, and corresponds to steps S203 and S204 in FIG. 4. FIG. 10 is a flowchart showing a part of an operation when the control unit 17 generates a guidance route and a route selection reason in the second embodiment of the present invention, and corresponds to steps S207 to S210 in FIG. 4. It is a figure which shows an example of the display screen displayed on the display part 7 in Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reading mechanism 2 Operation part 3 Transmission / reception part 4 VICS reception part 5 GPS reception part 6 Autonomous navigation sensor 6a Angle sensor 6b Distance sensor 7 Display part 8 Speaker 10 Navigation apparatus 11 Buffer memory 12, 13, 14, 15, 16 I / F
DESCRIPTION OF SYMBOLS 17 Control part 18 Map drawing part 19 Display information generation part 20 Guidance route memory | storage part 21 Guidance route drawing part 22 Icon drawing part 23 Audio | voice output part 24 Image composition part

Claims (10)

A navigation device for searching for a route to an input destination,
A cost calculating means for calculating a cost for each searched route;
Guided route determination means for determining any of the searched routes based on the cost as a guided route;
Route selection reason generation means for generating a route selection reason for the guidance route based on the cost;
And a display means for displaying the reason for route selection together with the guidance route. The cost calculation means calculates a cost for each item including at least one of road attribute cost, road width cost, lane number cost, branch cost, traffic light cost and distance cost, and a total value of the cost for each item. And
The guidance route determination means determines the guidance route based on a result of comparing the total cost for each item,
The navigation device according to claim 1, wherein the route selection reason generation unit generates the route selection reason based on a result of comparing the cost for each item.   The navigation device according to claim 1, wherein the cost calculating unit calculates a cost for each searched route by excluding a cost related to a highway. A navigation method for searching for a route to an input destination,
A cost calculating step for calculating a cost for each searched route;
A guided route determining step for determining any of the searched routes based on the cost as a guided route;
A route selection reason generation step of generating a route selection reason for the guidance route based on the cost. The cost calculating step calculates a cost for each item including at least one of road attribute cost, road width cost, lane number cost, branching cost, traffic light cost and distance cost, and a total value of the cost for each item. And
In the guide route determination step, the guide route is determined based on a result of comparing the total cost for each item,
The navigation method according to claim 4, wherein the route selection reason generation step generates the route selection reason based on a result of comparing the cost for each item.   5. The navigation method according to claim 4, wherein the cost calculating step calculates a cost for each searched route by excluding a cost relating to a highway. A program for causing a computer included in a navigation device to search for a route to an input destination,
A cost calculation process for calculating a cost for each searched route;
A guide route determination process for determining any of the searched routes based on the cost as a guide route;
A program for causing the computer to function a route selection reason generation process for generating a route selection reason for the guidance route based on the cost. The cost calculation processing calculates a cost for each item including at least one of road attribute cost, road width cost, lane number cost, branch cost, traffic light cost and distance cost, and a total value of the cost for each item. And
The guidance route determination process determines the guidance route based on a result of comparing the total cost for each item,
The program according to claim 7, wherein the route selection reason generation processing generates the route selection reason based on a result of comparing costs for each item.   8. The program according to claim 7, wherein the cost calculation processing calculates a cost for each searched route by excluding a cost related to a highway.   A recording medium on which the program according to claim 7 is recorded.

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