JP2008052077A - Navigation device and destination retrieving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation device enabling a user to easily narrow down where the desired point is located on a map, even when the address of a desired point is not registered in a retrieval list and pinpoint address retrieval is not possible, and a destination retrieving method. <P>SOLUTION: The map area 32 of a level matching the level of the address input by the operation of an operation section out of the levels of address registered in the retrieval list, is displayed. Also, in the map area 32, the house shape diagram 33 of the address that is not registered in the retrieval list is emphatically displayed in such a form that can be identified from the house shape diagram corresponding to the address registered in the retrieval list. Thus, even when the address that the user desires to retrieve is not registered in the retrieval list and the user cannot carry out pinpoint address retrieval, the user can easily narrow down where the desired address is by viewing the emphatically displayed house shape diagram. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a navigation device and a destination search method, and is particularly suitable for use in a navigation device and a destination search method having a function of searching for a destination (a destination or a waypoint) from an address.

  In general, in-vehicle navigation devices detect the current position of a vehicle using a self-contained navigation sensor, a GPS (Global Positioning System) receiver, or the like, read out map data in the vicinity of the vehicle, and display it on a screen. Then, the vehicle position mark indicating the vehicle position is superimposed and displayed at a predetermined location on the screen, so that it can be seen at a glance where the vehicle is currently traveling.

  Most navigation devices are equipped with a route guidance function. This route guidance function automatically searches for the route with the lowest cost from the current location to the destination using map data, and uses the searched route as a guidance route to change the color of other roads on the map screen. draw. Further, when the vehicle approaches a guidance intersection on the guidance route within a certain distance, an enlarged view of the intersection is displayed and the intersection is guided to guide the driver to the destination.

  Usually, in this type of navigation device, several destination search methods are prepared. For example, a so-called address search in which a user searches for a specific point by operating an operation unit such as a remote controller and inputting an address name is known. In other words, the navigation device has address data that is a database of Nippon Telegraph and Telephone Corporation's Town Page (registered trademark) as a search list, and it matches the address name by collating the input address name with the search list. It is designed to be able to search for a point to do by pinpoint.

  However, since an address that is not registered in the town page does not exist in the search list of the navigation device, it is not possible to pinpoint a desired point even if an address search is performed. In that case, search again with another destination search method, or search for an area that can be searched with a registered address and predict the vicinity (for example, enter an address name up to ○ chome and search There was only a way to predict the point corresponding to the address from the displayed map area.

  For example, as shown in FIG. 6 (a), when not all the last addresses that are lower layers of “Aomachi 985, Yokohama City” are registered in the search list, the last addresses that can be selected from the menu are actually It becomes only a part of the last address that exists. In the case of the example of FIG. 6A, for example, the points from the third address to the fifth address cannot be searched for pinpoint by the address input. In this case, for example, address 2 is selected and searched, and a point of a desired address is predicted from the map area displayed as shown in FIG. 6B (a map showing a predetermined range centered on address 2). There is a need.

In addition, when the address that matches the input address does not exist in the search list, the representative point map of the address at the matching level is displayed, and the address lower than the matching level is displayed as the candidate address. A navigation device has been proposed (see, for example, Patent Document 1). In the navigation device described in Patent Document 1, for example, when there is no address in the search list that matches the input address “3-4” below “XX1-chome”, the representative point of the address “3” A map is displayed, and “6”, “8”, and “9” are displayed as candidate addresses when addresses “3-6”, “3-8”, and “3-9” are registered in the search list. Has been made.
JP 2002-202142 A

  However, in the conventional techniques including Patent Document 1, even if a representative point map of an address at a level matching the address registered in the search list is displayed, a user does not anticipate a desired point that is not registered in the search list. However, there is a problem that it is difficult to know where the desired point is. Further, in the above conventional technique, even if an address lower than the matching level is displayed as a candidate address, it is only an address registered in the search list and not an address of a desired point. For this reason, there is no choice but to predict a desired point from a map displayed by searching other addresses that can be searched, and there is a problem that it is difficult to know where the desired point is.

  The present invention has been made to solve such a problem. Even when the address of the desired point is not registered in the search list and the address cannot be searched for at a pinpoint, the desired point is not displayed on the map. An object is to allow a user to easily narrow down where the above is.

In order to solve the above-described problems, the present invention displays a map area of a hierarchy that matches the address input by the operation of the operation unit among the addresses of each hierarchy stored as address data in the map storage unit. In addition, in the map area, the house plan corresponding to the address stored as the address data at the address lower than the matching hierarchy can be distinguished from the house plan of the address not stored as the address data. It is made to display in the aspect.
Moreover, you may make it display the number of the address memorize | stored as address data with the house figure corresponding to it in the above-mentioned map area.

  According to the present invention configured as described above, for example, even when the lowest address is not registered in the address data (search list) and the address of the address cannot be pinpointed, the address above it Is registered in the search list, the map area indicated by the address of the upper layer is displayed, and in the map area, the house plan of the address not registered in the search list at the address of the lowest layer is displayed. It is displayed in a manner distinguishable from the house plan of the address registered in the search list. In this case, the house plan of the desired address that the user wants to search is one of the house plans displayed as those of addresses not registered in the search list. As a result, the user can easily narrow down the house plan at the desired address.

  If the address number registered in the search list is displayed together with the corresponding house plan, the location of the address where the number is displayed and the address not registered in the search list From the relationship with the position of the house drawing displayed as, it becomes possible to narrow down which house drawing of the desired address is with higher accuracy.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of the navigation device according to the present embodiment. In FIG. 1, reference numeral 1 denotes a map recording medium such as a DVD-ROM, which stores map data necessary for map display, route search, and the like. Although the DVD-ROM 1 is used here as a recording medium for storing map data, other recording media such as a CD-ROM, a hard disk, and a semiconductor memory may be used. Reference numeral 2 denotes a DVD-ROM control unit which controls reading of data from the DVD-ROM 1.

  The map data stored in the DVD-ROM 1 includes, in addition to road data used for map display and route search, address data at each point (facility, house, etc.) existing on the map, facilities at each point, House shape data representing the shape of a house (house shape diagram) is included. The address data is generated by making a town page (registered trademark) into a database, and is used as a search list when performing address search.

  FIG. 2 is a diagram showing an example of address data (search list) according to the present embodiment. As shown in FIG. 2, the address data of this embodiment is configured by hierarchically combining prefectures, municipalities, town names, and addresses. The address is also divided into a plurality of hierarchies. For example, if the address is “985-2”, data “985” is stored in the first layer of the address, and “2” is stored in the second layer of the address (the lowest layer in this case). Although not shown in FIG. 2, if the address is “1-7-5”, the first layer of the address is “1”, the second layer of the address is “7”, the third layer of the address ( Data “5” is stored in the lowermost layer in this case.

  The house shape data includes house shape data representing the house shape map corresponding to the address stored as the address data and house shape data representing the house shape map of the address not stored as the address data. . That is, in the example of FIG. 2, not only house shape data representing the house shape map corresponding to “985, 2, 8, 10 and 13” stored as address data, but also stored as address data “ House shape data representing a house shape map of address 985, 1, 3-7, 11, 12 "is also included in the map data. Normally, when the map data is updated, the house shape data is also updated. However, if the address is not registered in the town page (registered trademark), the address data is not updated, and the address data is stored even though there is the house shape data. A non-existent state can occur.

  Reference numeral 3 denotes a position measuring device that measures the current position of the vehicle, and includes a self-contained navigation sensor, a GPS receiver, a position calculation CPU, and the like. The self-contained navigation sensor includes a vehicle speed sensor (distance sensor) that outputs a single pulse for each predetermined travel distance to detect the travel distance of the vehicle, and an angular velocity sensor such as a vibration gyro that detects the rotation angle (movement direction) of the vehicle. (Relative orientation sensor). The self-contained navigation sensor detects the relative position and direction of the vehicle using these vehicle speed sensor and angular velocity sensor.

  The position calculation CPU calculates the absolute own vehicle position (estimated vehicle position) and vehicle direction based on the relative position and direction data of the own vehicle output from the self-contained navigation sensor. The GPS receiver receives radio waves transmitted from a plurality of GPS satellites by a GPS antenna and performs a three-dimensional positioning process or a two-dimensional positioning process to calculate the absolute position and direction of the vehicle (the vehicle direction is The calculation is based on the current vehicle position and the current vehicle position one sampling time ΔT before).

  A map information memory 4 temporarily stores map data (including the address data and the house data described above) read from the DVD-ROM 1 under the control of the DVD-ROM control unit 2. This map information memory constitutes the map storage unit of the present invention.

  Reference numeral 5 denotes a processor (CPU), which controls the entire navigation device. Reference numeral 6 denotes a ROM which stores various programs (guidance route search program, address search program, etc.). Reference numeral 7 denotes a RAM that temporarily stores data obtained in the course of various processes and data obtained as a result of various processes.

  The CPU 5 performs a process of searching for the route with the lowest cost connecting the current location to the destination using the map data stored in the map information memory 4 according to the guidance route search program stored in the ROM 6. Further, the CPU 5 performs an address search process when setting a destination according to the address search program stored in the ROM 6. Reference numeral 8 denotes a guidance route memory, which stores guidance route data set by the CPU 5 as described above. The guidance route data represents, for example, the position of each node from the current location to the destination.

  Reference numeral 9 denotes an operation unit such as a remote controller, in which the user sets various information (for example, the destination of the guidance route) for the navigation device, or performs various operations (for example, menu selection operation, enlargement / reduction operation, manual map). Various controls (buttons, joystick, numeric keypad, etc.) for performing scrolling etc. are provided. Reference numeral 10 denotes an interface unit that accepts various types of operation information of the operation unit 9. The interface unit 10 corresponds to a data input unit of the present invention that receives an input of a desired address name through the operation of the operation unit 9.

  A display controller 11 generates map image data necessary for display on the display device 18 based on the map data stored in the map information memory 4. A video RAM 12 temporarily stores image data generated by the display controller 11. That is, the image data generated by the display controller 11 is temporarily stored in the video RAM 12, and image data for one screen is read and output to the image composition unit 17. Reference numeral 13 denotes a menu generation unit that generates and outputs a menu image necessary when the user performs various operations.

  Reference numeral 14 denotes a guidance route generator, which generates guidance route drawing data using the result of route search processing stored in the guidance route memory 8. That is, the guidance route generation unit 14 selectively reads out the guidance route data stored in the guidance route memory 8 and included in the map area drawn in the video RAM 12 at that time, Draws the guidance path boldly highlighted in different predetermined colors.

  A mark generating unit 15 generates and outputs a vehicle position mark displayed at the vehicle position after the map matching process, various landmarks displaying a gas station, a convenience store, and the like. Note that the map matching process includes the map data read into the map information memory 4, the vehicle position and vehicle orientation data measured by the GPS receiver measured by the position measuring device 3, and the estimated vehicle by the autonomous navigation sensor. This refers to processing for correcting the position of the vehicle on the road of the map data using the position and vehicle direction data.

  Reference numeral 16 denotes an immediately preceding hierarchy area drawing unit. When the CPU 5 performs an address search process in accordance with the address search program stored in the ROM 6, the address of each hierarchy stored as address data in the map information memory 4. In addition to drawing a map area (hereinafter referred to as the immediately preceding hierarchy area) of the hierarchy that coincides with the address input from the interface 10 (the hierarchy one level before inputting the address of a certain hierarchy), The house drawing corresponding to the address stored as the address data at the address lower than the above-mentioned matching hierarchy is drawn in a manner distinguishable from the house drawing of the address not stored as the address data. .

  At this time, the immediately preceding hierarchy area drawing unit 16 displays the number of the lowest address stored as address data in the map information memory 4 in the immediately preceding hierarchy area together with the house plan corresponding to the address. Further, the immediately preceding hierarchy area drawing unit 16 highlights and displays the house plan of the address that is not stored as address data. The highlighting is realized, for example, by changing the color of the other house plans and displaying them with a thicker line than other house figures. The immediately preceding hierarchical area drawing unit 16 corresponds to a display processing unit of the present invention.

  Reference numeral 17 denotes an image composition unit that synthesizes and outputs various images. That is, the map image data read by the display controller 11 is overlaid with each image data output from each of the menu generation unit 13, the guidance route generation unit 14, the mark generation unit 15, and the immediately preceding hierarchy area drawing unit 16. Then, image synthesis is performed, and the synthesized image data is output to the display device 18.

  FIG. 3 is a diagram showing an example of screen transition at the time of address search according to the present embodiment. FIG. 3A shows a screen example in the middle of inputting a desired address name in the address search. That is, FIG. 3A shows an example of a screen at the stage where an address is input to “985 Aocho, Midori-ku, Yokohama” through the menu screen generated by the menu generator 13, followed by the branch number of the address. (Lowest address) can be selected from the list. When the address data as shown in FIG. 2 is stored in the map information memory 4, the menu generating unit 13 sets “2, 8, 9, 10” as the lowest address that can be selected as shown in FIG. , 13 ”are displayed in a list.

  If the address that the user wants to search is included in the address of the lowest layer displayed in the list, the point of the desired address is searched for by pinpointing by selecting the address by operating the operation unit 9 can do. However, if there is no desired address in the list, the desired address cannot be pinpointed. In this case, the area narrowing button 31 may be pressed. When the area narrowing button 31 is pressed, a screen as shown in FIG. The screen of FIG. 3B is drawn by the immediately preceding hierarchy area drawing unit 16.

  The immediately preceding hierarchy area drawing unit 16 has an immediately preceding hierarchy area 32 of the address “985, Aotocho, Midori-ku, Yokohama-shi” input by the operation of the operation unit 9 (this address is stored as address data in the map information memory 4). Draw. Further, the immediately preceding hierarchy area drawing unit 16 includes a house plan corresponding to the lowest address “2, 8 to 10, 13” stored as address data in the drawn immediately preceding hierarchy area 32, and address data. The house figures of the addresses “1, 3 to 7, 11, 12” which are not stored are drawn in a manner distinguishable from each other. In the example of FIG. 3B, the house plan 33 of the address “1, 3-7, 11, 12” which is not stored as address data is highlighted. The numbers of the lowest address “2, 8-10, 13” stored as address data are displayed together with the house plan corresponding to the address.

  Drawing of the immediately preceding hierarchy area 32 can be performed as follows, for example. That is, drawing data of the immediately preceding hierarchical area 32 corresponding to the address “985 Aocho, Midori-ku, Yokohama-shi” is prepared in advance as part of the map data, and is read from the map information memory 4 and drawn. However, in this case, if the number of drawing data to be prepared increases, a large-capacity storage area is required.

  Therefore, instead of preparing drawing data in advance, it is also possible to dynamically calculate and draw the immediately preceding hierarchy area 32. For example, as shown by the thick solid line in FIG. 4 (a), a plurality of points where address data is stored up to the lowest address "2, 8 to 10, 13 of Aoto-cho 985, Midori-ku, Yokohama-shi" are connected. The area is drawn as the immediately preceding hierarchy area 32 ′.

  In this case, the immediately preceding hierarchy area 32 ′ drawn as the area of “Aochocho, Midori-ku, Yokohama-shi” becomes narrower than the original area (area shown as the immediately preceding hierarchy area 32 in FIG. 3B), Originally, points included in the area of “985 Aocho, Midori-ku, Yokohama-shi” may not be included in the immediately preceding hierarchy area 32 ′. In order to avoid such inconvenience, it is preferable to perform the following processing.

  For example, as shown by a dotted line in FIG. 4 (a), the immediately preceding hierarchy area 32 ′ drawn first is expanded to the position of the surrounding roads and rivers to make the immediately preceding hierarchy area 32 ″. Is often the boundary of the address, so the boundary of the immediately preceding hierarchy area 32 ″ is set along the road or river.

  However, if the extension is unlimited, there is a high possibility that an extra area will be included. Therefore, it is preferable to limit the distance from the original previous hierarchy area 32 'to the road or river to be expanded within a predetermined value. Further, the road that is the boundary of the immediately preceding hierarchy area 32 ″ that is to be expanded may be limited to the main road that is often the boundary of the address. For example, as shown in FIG. 4 (a), it is possible to obtain an immediately preceding hierarchical area 32 ″ that is not expanded in the right direction of the map but expanded only in the left direction and the vertical direction.

  As another method, a method as shown in FIG. 4B may be used. That is, in the “address 985”, the immediately preceding hierarchy area 32′-1 is set by connecting a plurality of points where the address data is stored up to the address of the lowest layer, and the address data of the lowest layer is also set in the address adjacent thereto. The immediately preceding hierarchy area 32′-2 is set by connecting a plurality of points stored up to the address. Then, the immediately preceding hierarchy area 32′-1 of the address “Yokohama City Midori-ku Aotocho 985” is expanded so as to include points that are not included in the immediately preceding hierarchy area of any address, and indicated by a dotted line. The previous hierarchical area 32 ″ is drawn.

  In this case, a point that is not included in the immediately preceding hierarchy area 32′-1, 32′-2 of any address may belong to an address adjacent to the address instead of “985 address”. There is a possibility that it belongs to the “985 address”. By including such a point in the immediately preceding hierarchy area 32 "of" address 985 ", it is possible to prevent the inconvenience that a spot that originally belongs to" address 985 "deviates from the immediately preceding hierarchy area 32".

  Next, the operation of the navigation device according to the present embodiment configured as described above will be described. FIG. 5 is a flowchart showing an example of the operation of the navigation device according to the present embodiment (the processing procedure of the destination search method). In FIG. 5, the interface unit 10 receives a desired address name input by the user operating the operation unit 9 through the address search menu screen drawn by the menu generation unit 13 (step S1). Further, the CPU 5 determines whether or not the area narrowing button 31 has been pressed based on operation data input from the interface unit 10 through operation of the operation unit 9 (step S2).

  Here, if it is determined that the area narrowing button 31 has not been pressed, that is, an address has been input up to the lowest address, and a search instruction has been made (the completion button shown in FIG. 3A has been pressed). If it is determined, the CPU 5 searches for a point corresponding to the input address using the address data (search list) stored in the map information memory 4 (step S3).

  On the other hand, if it is determined that the area narrowing button 31 has been pressed, the CPU 5 determines whether the address address input at that stage is in the address data (search list) stored in the map information memory 4. Check out. That is, it is determined whether or not the address number input in step S1 matches the address indicated by the address data stored in the map information memory 4 (step S4). If it is determined that the input address is not in the search list, the CPU 5 controls the menu generating unit 13 to display an error on the display device 18 (step S5), and the process of step S1. Return to.

  If it is determined that the address of the input address is in the search list, the CPU 5 controls the immediately preceding hierarchy area drawing unit 16 to input the address input in step S1 as shown in FIG. The previous hierarchy area 32 of the hierarchy corresponding to the address of the name is displayed on the display device 18, and the house plan corresponding to the address stored as the search list at the lowest address in the immediately preceding hierarchy area 32, The house drawings at the addresses not stored as the search list are displayed on the display device 18 in a manner that allows them to be distinguished from each other (step S6).

  As shown in FIG. 3B, a cursor 34 is displayed together with the immediately preceding hierarchy area 32, and a desired point can be selected by operating the operation unit 9 to move the cursor 34. ing. The user selects a house plan at a desired address from the relationship between the position of the address displayed as a number and the position of the house plan highlighted as that of an address not registered in the search list. In anticipation of this, the cursor 34 is placed on one of the house plans and selected (step S7).

  When any one of the house plans is selected, the CPU 5 uses the map data stored in the map information memory 4 to search for a spot corresponding to the selected house plan (step S8). Here, the corresponding facility or house is searched based on the position data of the selected house plan. When a point search is performed in step S3 or step S8, the CPU 5 controls the menu generation unit 13 to perform what kind of processing is performed on the searched point (for example, set as a destination or a transit point). A menu screen for setting, viewing detailed information, setting the current location, or the like is displayed on the display device 18. And the process according to the instruction | indication from the user performed through operation of the operation part 9 is performed.

  Here, the facility or house corresponding to the position of the selected house plan is searched, but the present invention is not limited to this. For example, when a desired house plan is selected, what kind of processing is to be performed on the point of the selected house plan without performing a search (for example, whether to set a destination or a transit point) A menu screen indicating whether to view detailed information or to set the current location may be displayed on the display device 18.

  As described above in detail, in the present embodiment, the immediately preceding hierarchy area 32 of the hierarchy that matches the address input by the operation of the operation unit 9 among the addresses of each hierarchy stored as the address data (search list). A house figure corresponding to an address stored as address data at an address lower than the matching hierarchy in the immediately preceding hierarchy area 32, and a house figure of an address not stored as address data Are displayed in a manner distinguishable from each other.

  With such a configuration, for example, even when the lowest address is not registered in the search list and the address of the address of the address cannot be pinpointed, the immediately preceding hierarchy area 32 indicated by the higher address is displayed. In addition, in the immediately preceding hierarchy area 32, the house plan of the address that is not registered in the search list at the lowest address is highlighted in a manner that can be distinguished from the house plan of the address registered in the search list. Is displayed. As a result, the user can recognize that there is a desired address in the highlighted house plan, and can easily narrow down the desired address.

  In the present embodiment, in the immediately preceding hierarchy area 32, a number representing an address stored as a search list is displayed together with a corresponding house plan. When configured in this way, the house shape of the desired address is determined based on the relationship between the position of the address where the number is displayed and the position of the house plan highlighted as that of the address not registered in the search list. It becomes possible to narrow down which figure is more accurate.

  In the above embodiment, the example in which the previous hierarchy area is displayed when the address data of the desired point to be searched does not exist in the search list has been described. However, the present invention is not limited to this. For example, even when address data of a desired point to be searched exists in the search list, the previous hierarchy area may be displayed by inputting an address halfway and pressing the area narrowing button 31.

  Moreover, although the said embodiment demonstrated the example which displays an immediately preceding hierarchy area when the area narrowing down button 31 was pushed, it is not limited to this. For example, when the first layer of the address is input, the immediately preceding hierarchy area corresponding to the address of the first layer may be automatically displayed. In addition, in the case of an address where the third layer of the address exists, the immediately preceding hierarchical area corresponding to the address of the second layer may be automatically displayed when the second layer of the address is input. good. The display of the immediately preceding hierarchy area in these cases may be displayed large on one screen as shown in FIG. 3 (b), or the screen may be divided beside the address selection list as shown in FIG. 3 (a). It may be displayed.

  Further, when displaying the immediately preceding hierarchy area as shown in FIG. 3B, it may be displayed when the map data being used is updated. In this way, it is possible to grasp the freshness of the map data including house shape data and address data, and how reliable is the house shape map and address display included in the immediately preceding hierarchy area being displayed? It is possible to narrow down a desired point after predicting.

  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. In other words, the present invention can be implemented in various forms without departing from the spirit or main features thereof.

It is a block diagram which shows the structural example of the navigation apparatus by this embodiment. It is a figure which shows the example of the address data (search list) by this embodiment. It is a figure which shows the example of a screen transition at the time of the address search by this embodiment. It is a figure which shows the example of the drawing method of the immediately preceding hierarchy area by this embodiment. It is a flowchart which shows the operation example (processing procedure of the destination search method) of the navigation apparatus by this embodiment. It is a figure which shows the example of a screen transition at the time of the conventional address search.

Explanation of symbols

4 Map information memory 5 CPU
DESCRIPTION OF SYMBOLS 9 Remote control 10 Interface part 13 Menu generation part 16 Immediate hierarchy area drawing part 17 Image composition part 18 Display apparatus 31 Area narrowing down button 32 Immediate hierarchy area 33 House figure which is not registered in the search list of address search

Claims (3)

A map storage unit for storing map data including address data formed by hierarchically combining prefectures, municipalities, town names, and addresses, and house shape data representing a house shape map of each point on the map;
A data input unit that receives input of a desired address name through operation of the operation unit;
Among the addresses of each hierarchy stored as the address data in the map storage unit, the map area of the hierarchy that matches the address input from the data input unit is displayed, and the coincidence in the map area Display processing unit for displaying a house figure corresponding to the address stored as the address data at a lower address than the hierarchy and a house figure of the address not stored as the address data in an identifiable manner. And a navigation device. The display processing unit displays a number of an address stored as the address data in the map storage unit together with a house plan corresponding to the address in the map area. The navigation device described. A first step of receiving an input of a desired address name through operation of the operation unit;
The address of the address name input in the first step matches the address indicated by the address data formed by hierarchically combining the prefectures, municipalities, town names, and addresses stored in the map storage unit. A second step of determining whether or not
In addition to displaying the map area of the hierarchy in which the address of the address name input in the first step matches the address indicated by the address data, the address in the lower layer than the matched hierarchy in the map area A third step of displaying a house drawing corresponding to the address stored as the address data and a house drawing of the address not stored as the address data in a manner distinguishable from each other. Destination search method.