JP2002257582A - Portable navigation system and navigation program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly cope with a case of getting lost by guiding a route by a display of a map and the route by a small portable terminal. SOLUTION: This portable navigation system guides the route by displaying the map on a display means of the portable terminal 3 having keys, and has a storage means for storing map data, a route searching means 13 for searching the route between a present place or a starting place and a destination on the basis of the map data stored in the storage means, a number imparting means for imparting a number to a guide point on the searched route, a display control means for displaying the route searched on the map on the display means of the portable terminal, and displaying an enlarged map of the guide point corresponding to the number by key operation, and a determining means for determining whether or not a user is in a state of getting lost on the basis of guide progress information by the display control means, and guides the route by displaying the map on an image screen of the portable terminal by communicating with the portable terminal 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable navigation system and a navigation program for displaying a map on a display means of a portable terminal having keys and guiding a route.

[0002]

2. Description of the Related Art A vehicular navigation apparatus tracks a current position using a GPS, a vehicle speed sensor, and the like, and guides a departure point and a route from a current position to a destination, which are set and input. Although large, heavy, portable and not accessible to pedestrians.

[0003] Instead of being mounted on such vehicles,
A portable navigation device that is lightweight, small, and convenient to carry has also been proposed. Since the portable navigation device does not have a function of detecting the current position, for example, in a route such as a downtown area where there are several intersections close to each other, even if the route guidance to the destination is displayed on the map, it should be turned. It is easy for the corner to be determined incorrectly or for the wrong intersection to turn. In addition, when the map is enlarged, if there are no or few landmarks, there is a problem that it is difficult for the user to understand the current position.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a route guidance by displaying a map and a route on a small portable terminal so that it is possible to appropriately cope with a lost route. It is to be.

Therefore, the present invention relates to a portable navigation system for displaying a map on a display means of a portable terminal having a key and guiding a route, wherein a storage means for storing map data, and a map stored in the storage means. Route search means for searching for a route between a current location or a departure place and a destination based on data; number-assigning means for assigning a number to a guide point on the searched route; and a map for the display means of the portable terminal. A display control means for displaying the route searched above and displaying an enlarged map of the guide point corresponding to the number by the key operation, and a state in which the user is lost on the basis of the guidance progress information by the display control means Determining means for determining whether or not the above is true.

In a portable navigation system for communicating with a portable terminal and displaying a map on the screen of the portable terminal to guide a route, a portable terminal having a key, a display means and a communication control means, and a portable terminal A communication center, the center comprising: storage means for storing map data;
Route search means for searching for a route between a current location or a departure point and a destination based on the map data stored in the storage means, numbering means for numbering a guide point on the searched route, A display control means for displaying the route searched on the map on the display means of the portable terminal, and displaying an enlarged map of the guide point corresponding to the number by the key operation, and a progress of the guidance by the display control means. And determining means for determining whether or not the user is lost on the basis of the information.

Further, the determining means calculates an estimated time of arrival at the destination, determines that the vehicle has not arrived at the destination after a lapse of a predetermined time from the calculated estimated time of arrival, and performs a key operation for displaying the enlarged map. Is counted, the required number of times between guide points is calculated when the counted number exceeds a predetermined value, and the road is operated on condition that the key operation is not performed even if the calculated required time has elapsed for a predetermined time. It is characterized by determining that the user is in a lost state.

The route searching means, when the determining means determines that the vehicle is lost, notifies the user that the vehicle is lost and searches again for a route between the present location and the destination. When a route that prioritizes a large road, a route with many landmarks is re-searched, and the current location information input for the re-search is information that cannot specify a point,
Based on the progress information of the guidance, search and provide candidate locations by narrowing the area, the route information of the guidance includes the place of departure, the destination, or the point determined to be lost on the route, From a certain area.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating an embodiment of a portable navigation system according to the present invention, FIG. 2 is a diagram illustrating a front view of a portable terminal, and FIG. 3 is a diagram illustrating a configuration example of data. In the figure, 1 is a navigation center, 2 is a communication line, 3 is a portable terminal, 4 is guidance information providing means, 5 is user information storage means, 6 is user identification means, 7 is map data, and 8 is POI.
Data, 9 road data, 10 public transport data,
11 is a map image generating means, 12 is a POI searching means, 13 is a route searching means, 14 is an information input / output means, 15 is a communication means, 21 is a display section, and 22 is a numeric keypad input section.

In FIG. 1, a navigation center 1 is a server that communicates with a user's portable terminal 3 via a communication line 2, searches for a route to a destination according to a user's request, and provides guidance information. It has a guidance information providing unit 4, a user information storage unit 5, a user identification unit 6, and the like.

[0011] The guide information providing means 4 is provided with the map data 7, P
OI data 8, road data 9, public transport data 10
And other data required for map drawing, point search, route search, and provision of guidance information.
It has a POI search means 12, a route search means 13, an information input / output means 14, and a communication means 15.

The map data 7 is data for drawing a map image, and includes polygon data for drawing a specific area such as a node, a link, a house shape or a park whose area is defined by coordinates and a park for drawing a road. It has display character data for displaying on a map storing coordinates and names.
The POI data 8 has facility data for searching for points of departure, destination, and guide points, and also includes town page information and the like. The road data 9 is data for searching for a route, and includes information such as a cost and a type of road peculiar to a portable navigation system for pedestrians different from an in-vehicle navigation system for determining an optimal route. Or, it has the same data as an in-vehicle navigation system and changes costs by calculating routes.
From the viewpoint for pedestrians, roads that are not suitable for walking, such as toll roads and elevated roads, are not targeted for route search, and regulations such as right / left turn and one-way traffic are not considered. Also, wide roads such as national roads,
It is said that there are guardrails and wide sidewalks are easy to pass. The public transportation data 10 is data of transportation including aviation, buses, ships, etc. as well as JR / private railways. For example, route data having station information for each line such as JR XX line, Yamanote line, For example, timetable data.

The map image generating means 11 generates a map image based on the map data 7, and generates a map image displaying characters such as roads, routes, houses, parks, names, and the like. The POI search means 12 uses the POI data 8 to input a point such as a destination or a guide point, for example, by inputting a telephone number to obtain corresponding point information (name, address,
Coordinates, etc.). The route search means 13
A route search is performed using road data 9 and public transportation data 10 in response to a route request based on designation of a departure place, a destination, search conditions, and the like. To find the route. The information input / output means 14 performs a route request and a guidance start request from the portable terminal 3 of the user, a current location input / selection, and outputs a generated map image, a searched point, a search result, and guidance information to the portable terminal 3. The communication means 15 communicates with the user's portable terminal 3 via the communication line 2.

The search method performed by the route search means 13 is, for example, as follows. By specifying the departure place, the nearest station (riding station) from the departure place is set to several stations, for example, three stations.
By specifying only the stations and specifying the destination in the same manner, the nearest station (disembarkation station) from the destination is a few stations, for example, 3 stations.
We narrow down to station and identify. Then, using the road data, the walking route from the departure point to each boarding station, using the public transportation data, the transportation route from each boarding station to each getting off station, and further using the road data, walking from each getting off station to the destination. Search for each route. Further, by combining these walking routes and transportation routes, the total cost from the departure point to the destination is calculated, and the route with the lowest cost is presented. At this time, the cost can be changed by inputting the shortest time, the minimum fare, the minimum number of transfers as the total cost as a search condition.

The user information storage means 5 sequentially stores information such as a departure place, a destination, search information, a current location, and a route search result for each user.
The user is identified by recognizing the ID key of each user.

The portable terminal 3 has a display unit 21 capable of displaying a map search list and a menu as shown in FIG. 2, and a numeric keypad capable of inputting alphanumeric characters and kana kanji and inputting a screen scrolling instruction. Part 22
For example, a mobile phone having a communication function. Then, it communicates with the navigation center 1 via the communication line 2,
By inputting the current location, departure location, and destination from the numeric keypad input unit 22, a map for route guidance to the destination searched by the navigation center 1 is displayed on the display unit 21, or the guidance point is input by inputting a guidance point. Or an enlarged view of.

The road data 9 is, for example, shown in FIG.
As shown in (A), the road number, its length, and the name of the starting point
The POI data 8 includes information such as coordinates (latitude and longitude), names and coordinates of end points, intersection names and road names, and the POI data 8 includes, for each point, a point name, a point coordinate as shown in FIG. , Address, telephone number, point division, display order, and the like. Specifically, for example, as shown in FIG. 3 (C), a building name, a store name, a facility name, and the like are registered as a point name, section information based on a genre is registered as a point section for search, and displayed for display. The priority may be registered according to the display screen, such as the point “1” displayed in the entire route display, “2”, “3” displayed in the enlarged map display. For example, "2" displayed in an enlarged view,
When the character “3” overlaps, here, the position of the display order of “2” is prioritized.

Next, an example of a communication processing flow between the portable terminal of the user and the server in the portable navigation system according to the present invention will be described. FIG. 4 is a diagram for explaining an example of communication between the portable terminal and the server and a processing flow between each means in the server.

In the portable navigation system according to the present invention, as shown in FIG. 4, for example, a route request is first sent from a portable terminal as a user to a server by designating a departure place, a destination and search conditions. The destination and the current location are, for example, PO, in order to specify the coordinates from the input values of the telephone number and name.
A search is performed using the I search means, a search result list is presented to the user, and the user selects from the list. On the server side, when receiving a route request from the portable terminal, the information input / output unit stores the destination, the name and coordinates of the departure place, the address and other information in the user information storage unit using the user ID as a key, A route search request is issued to the search means. As the user ID, for example, http from a browser on a mobile phone
Although the terminal specific information included in the p header is used, a user ID may be input. The information input / output unit, when notified of the route search result from the route search unit, presents the route search result to the portable terminal, and starts guidance in response to a guidance start request from the portable terminal.

If the current location is input from the portable terminal by name or telephone number while the guidance is continued, the information input / output unit issues a current location search request to the POI search unit and stores the user information. The destination and the departure place information are read from the means. The information input / output means narrows down the current location search result list based on the destination and departure information from the user information storage means in response to the notification of the current location search result list from the POI search means, and presents the current location list to the mobile terminal. I do. The information input / output unit issues a route search request to the route search unit according to the selection of the current location on the mobile terminal, receives the notification of the route search result from the route search unit, and presents the notification to the mobile terminal.

Further, description will be given in accordance with a specific processing flow. FIG. 5 is a diagram for explaining an example of the entire process and a destination setting process. FIG. 6 is a diagram for explaining an example of a route display process from the current location. FIG. FIG. 8 is a diagram for explaining an example of the initialization process, FIG. 8 is a diagram for explaining an example of the user check process, FIG. 9 is a diagram for explaining another example of the user check process, and FIG.
FIG. 1 is a diagram for explaining an example of a second route search process;
FIG. 1 is a diagram for describing an example of a current location determination process.

In the portable navigation system according to the present invention, a destination is set as shown in FIG. 5A as a whole (step S11), a route to the destination is searched, and a route from the current location is displayed. (Step S1)
2).

In the destination setting processing of step S11 of the above processing, a destination is input as shown in FIG. 5B (step S21), and the destination is searched (step S22). Is displayed (step S
23), and confirm the displayed destination (step S2)
4).

In the process of displaying the route from the current location in step S12, as shown in FIG. 6, first, the process of setting the current location is performed (step S31), and the route search process from the current location to the destination is performed (step S32). ), Initialization of the time and the like, calculation processing of the estimated arrival time of the destination (step S33), judgment of the guidance status, and user check processing of whether the user is lost or not (step S34). . If you get lost, if there is a request from the user, display a guide map or sentence according to the user's request,
Alternatively, the guide map may be displayed by determining whether or not the user is lost on the basis of the scheduled time.

In the current location setting process in step S31, a current location input screen is displayed as shown in FIG. 7A (step S41), the current location is entered (step S42), and the current location is searched. (Step S42)
The current location is determined (step S43).

In the initialization processing of the time and the like in step S33, the counter is reset to "0" as shown in FIG. 7B (step S45), and the timer 1 is set to the current time (step S46). ), The estimated arrival time is calculated (step S47). The estimated arrival time is obtained by calculating, for example, route distance / average speed per pedestrian (for example, 4 km / h).

In the user check process in step S34, a map is displayed as shown in FIG.
51) It is determined whether or not the map has been changed by an instruction from the user (step S52). If there is a map change, the counter is incremented by +1 (step S53), and it is determined whether or not the count value has exceeded a certain value α (step S54). The same processing as the above processing is repeatedly executed. If the count value exceeds a certain value α,
A message "I am lost" is displayed (step S57).

If the result of determination in step S52 is that there is no change in the map, it is determined whether or not the vehicle has arrived at the destination (step S55).
It is determined whether the current time has exceeded the estimated arrival time + the fixed value β (step S56). If the current time has already passed a predetermined time from the estimated time of arrival, that is, if the destination has not arrived at the destination even after elapse of β from the estimated time of arrival, “I am lost” Is displayed (step S57), and if the current time is still within the allowable range, the process returns to step S51, and the same processing as the above processing is repeatedly executed.

As described above, in the portable navigation system according to the present invention, when the map is changed frequently and exceeds a certain value α, or when a certain time β
If it does not arrive at the destination even after passing, it is determined that it is lost. In addition, it may be determined that the map is lost on the condition that the map is not reduced after being enlarged, or that the same part is enlarged many times.

When it is determined that the user is lost, in the above-described processing shown in FIG. 8, "Wandering" is displayed, but after the processing, the second processing is performed as shown in FIG. May be performed (step S5).
8). In the search processing of the second route, for example, FIG.
As shown in (A), first, the current location is re-input (step S61), and after the current location is determined (step S62), a search for a route using a large road is performed (step S63).
Alternatively, as shown in FIG. 10B, a search for a route with many famous landmarks is performed (step S73).

In the portable navigation system according to the present invention, the reference setting means provides guidance such as the estimated arrival time based on the required time to the destination based on the average walking speed, the expected number of times the display map is switched according to the route, and the like. The reference value is set based on the progress information, and the time,
A value reflecting the user's action for route guidance such as the number of user operations is compared with a reference value. If the reference value is exceeded by the determination means, it is determined that the user is out of the route, that is, lost. . The number of scheduled instructions is set based on the number of guide points on the route. If there are four guide points including near the current location and near the destination, four switching operations to the enlarged map and four return operations are possible. For example, the scheduled instruction count is set to 10 in consideration of an error.

Further, when the current position is re-input in the search processing for the second route, if there is no means for detecting the current position, information must be found and input from around the current position. The information in this case includes, for example, information obtained from a signboard that is visible in the surroundings, such as a telephone pole or an address written on a building (XXXX chome △), a telephone number,
There are names of convenience stores, gas stations, supermarkets, facilities, and landmarks. However, among these,
There are those that can specify a point, such as a lot number and a telephone number, and those that cannot be specified in a chain store name or other places. Therefore, in the latter case, the corresponding candidates are listed. However, if there is no area limitation information, the target is extremely extended to the whole area of the whole country.

Therefore, according to the present invention, when the current location is re-entered with a lot number or telephone number that can specify the location (step S6).
First, as shown in FIG. 11, it is checked whether or not the current location re-entered in the current location determination processing has coordinate values (step S81), and the current location has coordinate values such as a building name and a facility name. If your location is not your current location,
The route information of the guide such as the destination and the guide route is acquired (step S82), and the area is narrowed down based on this information (step S83). The area is narrowed down based on the route information of the guidance, for example, using the prefecture and municipalities including the departure place and the destination as keywords, and if the departure place and the destination are wide areas, along the guidance route The prefectures and municipalities within a certain range from the point of the route determined to be lost (a certain distance range before and after the route, a certain distance width from the point, and a certain radius from the point) are used as keywords. Then, in the narrowed area, a name or the like re-entered as the current location is searched (step S84), and the searched result is provided as a candidate, for example, as a mark on a list or a map (step S85), and the result is determined. (Step S86). If the re-input current location has a coordinate value such as a telephone number or a lot number, the current location is determined at the coordinate location (step S86). In addition, when displaying a candidate, a point determined to be lost may be displayed together, so that reference information may be given when the current position is determined.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, a system using a server (navigation center) that communicates with a mobile phone via the Internet line has been described.
The present invention can be similarly applied to a system in which a mobile terminal communicates with a navigation center using a wireless communication line to provide route guidance on a small screen. It goes without saying that the present invention may be applied as a device provided. The number assigned to the guide point is set in the order of the route from the current location to the destination. However, when the current location proceeds along the route, for example, when the user arrives at the guide point, the user inputs a confirmation signal. By doing so, the number may be updated from the new current location and re-assigned.

Further, when the vehicle does not arrive at the destination even if the estimated arrival time has passed much, or when the number of changes in the map display is extremely large, it is determined that the vehicle is in a lost state. Calculated, and there is no change of the map display by key operation even if the calculated required time has passed a certain time,
A reference value may be set based on the route information, and the reference value may be compared with the behavior of the user to determine whether the user is proceeding along the route or lost. Therefore, the reference value is the estimated time of arrival based on the route distance and the like, and the expected number of times of the display map switching instruction by the user operation. Of course, whether or not the user is lost may include a factor that can be subjectively determined by a person, and indicates that the guidance is not progressing as scheduled, so that the user may directly determine. Then, even when it is determined that the user is lost, it is displayed that the user is lost.
The notification may be made by sound, or the display and the sound may be used in combination.

When the search range of the re-entered current location name is narrowed down, for example, when the area of the portable terminal can be detected from the transmitted radio wave, the relay station or the like, the information may be used. The same applies to the case where a GPS receiver is provided and the current position can be detected by receiving radio waves from artificial satellites. According to such information, even when the detection accuracy of the current location obtained by the mobile terminal is low, it can be effectively used in combination with the name of the re-input, and the number of candidates can be significantly narrowed down.

[0037]

As is apparent from the above description, according to the present invention, in a portable navigation system for displaying a map on a display means of a portable terminal having a key and guiding a route, storage of map data is stored. Means, a route search means for searching for a route between the current location or the departure place and the destination based on the map data stored in the storage means, and a numbering means for numbering a guide point on the searched route, A display control means for displaying the searched route on the map on the display means of the mobile terminal, and displaying an enlarged map of the guide point corresponding to the number by key operation, and a road based on the progress information of the guidance by the display control means. A portable navigation system that communicates with a portable terminal, displays a map on the screen of the portable terminal, and guides the user through a route. A mobile terminal having a key, a display means, and a communication control means, and a center for communicating with the mobile terminal. By providing each means in the center, when guiding a route from a screen of the mobile terminal, It is possible to determine whether or not the user is performing route guidance without being lost.

The determining means calculates the estimated time of arrival at the destination, determines that the destination has not arrived after a lapse of a predetermined time from the calculated estimated time of arrival, and indicates the number of key operations for displaying an enlarged map. Is counted, the number of times counted exceeds a predetermined value, the required time between guide points is calculated, and if the calculated required time passes for a certain period of time, there is no key operation, Since it is determined that the user is in a lost state, it is possible to determine the state in which the user is lost at an appropriate timing.

Further, the route searching means is characterized in that when the determining means determines that the vehicle is lost, it informs the user that he or she is lost and searches again for a route between the current position and the destination. And re-search for routes giving priority to large roads and routes with many landmarks. When it is determined that the user is in a lost state, the user is properly notified and a new easy-to-understand route is searched for and guided. be able to. If the current location information input for re-searching is information that cannot identify a point, the candidate location is searched and provided based on the progress information of the guidance, and the guidance route information is When re-entering the current location for re-searching, including a place determined to be lost on the ground, destination, or route, including a point determined to be lost, and narrowing down to a certain area from that point, Even if the input name has the same name in each place, it is possible to efficiently narrow down the candidate points.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a portable navigation system according to the present invention.

FIG. 2 is a diagram illustrating a front view of a portable terminal.

FIG. 3 is a diagram illustrating a configuration example of map data.

FIG. 4 is a diagram for explaining an example of communication between a portable terminal and a server and an example of a processing flow between units in the server.

FIG. 5 is a diagram illustrating an example of a flow of an entire process and a destination setting process.

FIG. 6 is a diagram illustrating an example of a process of displaying a route from a current location.

FIG. 7 is a diagram for describing an example of a current location setting process and a process of initializing time and the like.

FIG. 8 is a diagram illustrating an example of a user check process.

FIG. 9 is a diagram for explaining another example of the user check process.

FIG. 10 is a diagram for explaining an example of a second route search process.

FIG. 11 is a diagram for describing an example of a current location determination process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Navi center, 2 ... Communication line, 3 ... Portable terminal, 4 ... Guidance information provision means, 5 ... User information storage means, 6 ... User identification means, 7 ... Map data, 8 ... POI data, 9 ... Road data, 10 ... Public transport data, 11 ... Map image generation means, 12 ... POI search means, 13 ... Route search means,
14 information input / output means, 15 communication means, 21 display display section, 22 numeric key input section

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09B 29/10 G09B 29/10 A H04Q 7/34 H04B 7/26 106B (72) Inventor Yumi Shibata Aichi 6-18, Okamachi Harayama, Okazaki City, Aisin AW Co., Ltd. (72) Inventor Mayuko Hayashi 6-18 Okamachi Harayama, Okazaki City, Aichi Prefecture, Aisin AW Co., Ltd. (72) Inventor Yukio Yamamoto Aichi Prefecture 6-18, Okamachi Harayama, Okazaki City, Aisin AW Co., Ltd. (72) Inventor Masao Kawai 6-18 Okamachi Harayama, Okazaki City, Aichi Prefecture, Aisin AW Co., Ltd. (72) Inventor Yasuo Ito Tokyo 2-19-19 Sotokanda, Chiyoda-ku Inside Equos Research Co., Ltd. (72) Inventor Naoki Ushiki Sen, Tokyo 2-19-12 Sotokanda, Ta-ku Inside Equos Research Co., Ltd. (72) Inventor Hiroyuki Yamakawa 2-19-12 Sotokanda, Chiyoda-ku, Tokyo Co., Ltd. Inside Equos Research Co., Ltd. (72) Inventor Satoshi Kitano 2-19-12 Sotokanda, Chiyoda-ku, Tokyo Equos Research Co., Ltd. (72) Inventor Takashi Sugawara 2-19-12 Sotokanda, Chiyoda-ku, Tokyo Equos Research Co., Ltd. (72) Inventor Hiroki Hayashi 2-19-12 Sotokanda, Chiyoda-ku, Tokyo Equos Research Co., Ltd. (72) Inventor Kazuyuki Hirakawa 2-19-12 Sotokanda, Chiyoda-ku, Tokyo F-term in Equos Research Co., Ltd. Reference) 2C032 HB08 HB22 HB25 HC11 HC24 HD03 HD16 2F029 AA07 AB07 AC02 AC06 AC14 AC18 5B075 ND06 NK06 PP10 UU14 UU16 5H180 AA21 BB05 BB15 FF05 FF22 FF25 FF27 5K067 AA34 BB36 EE02 EE53 EE02EE

Claims (12)

[The claims] 1. A portable navigation system for displaying a map on a display unit of a portable terminal having a key and guiding a route, a storage unit for storing map data, and a current location based on the map data stored in the storage unit. Or, a route search means for searching for a route between the departure place and the destination, a numbering means for giving a number to a guide point on the searched route, and a display means of the portable terminal are searched on a map for the display means of the portable terminal. Display control means for displaying the route that has been routed, and displaying an enlarged map of the guide point corresponding to the number by the key operation, and determining whether or not the user is lost on the basis of the progress information of the guidance by the display control means. A portable navigation system, comprising: a determination means for determining. 2. A portable navigation system that communicates with a portable terminal, displays a map on a screen of the portable terminal, and guides a route, wherein the portable terminal includes a key, a display unit, and a communication control unit. It consists of a communication center,
A storage unit that stores map data, a route search unit that searches for a route between a current location or a starting point and a destination based on the map data stored in the storage unit;
Numbering means for assigning a number to a guide point on the searched route, and displaying the searched route on a map on a display means of the portable terminal through communication, and the guide point corresponding to the number by the key operation Portable navigation system comprising: display control means for displaying a magnified map of a vehicle; and judgment means for judging whether or not the user is lost on the basis of progress information of guidance by the display control means. . 3. The method according to claim 1, wherein the determining means calculates an estimated arrival time at the destination, and is lost on the condition that the estimated arrival time has not arrived at the destination within a predetermined time. 3. The portable navigation system according to claim 1, wherein: 4. The method according to claim 1, wherein the determining means counts the number of key operations for displaying the enlarged map, and determines that the user is lost on the condition that the counted number exceeds a predetermined value. The portable navigation system according to claim 1 or 2, wherein 5. The determining means calculates a required time between the guide points, and determines that the user is lost on the condition that the key operation is not performed even after a lapse of a predetermined time from the calculated required time. The portable navigation system according to claim 1 or 2, wherein: 6. The portable navigation device according to claim 1, wherein the route search means notifies the user that the user is lost when the determination means determines that the user is lost. system. 7. The method according to claim 1, wherein said route searching means re-searches a route between a current position and a destination when said determining means determines that the vehicle is lost.
A portable navigation system as described. 8. The portable navigation system according to claim 7, wherein said route search means searches again for a route giving priority to a large road. 9. The portable navigation system according to claim 7, wherein said route search means searches again for a route having many landmarks. 10. When the current location information input for the re-search is information that cannot specify a point, the route search means narrows down the area based on the route information of the guidance to search for a candidate location. 8. The portable navigation system according to claim 7, wherein the portable navigation system is provided. 11. The guidance route information includes a departure place, a destination,
Or, include the points that are determined to be lost on the route,
11. The portable navigation system according to claim 10, wherein a narrow area is narrowed down from the point. 12. A portable navigation program for displaying a map on a display means of a portable terminal having a key and guiding a route, wherein a route between a current position or a departure point and a destination is searched based on map data. A route search function to perform, a number assigning function of assigning a number to a guide point on the searched route, and displaying the searched route on a map on a display unit of the portable terminal, and corresponding to the number by the key operation. A navigation control program for realizing a display control function of displaying an enlarged map of the guide point, and a determination function of determining whether or not the user is lost on the basis of progress information of the guidance by the display control function. .