Abstract:
An information processing apparatus may be implemented as a route navigator, which uses a route navigation method and a computer program product. A processing circuit is used to calculate respective passage frequencies of passageway segments in a passage history. The processing circuit then selects a navigation route to a destination, includes at least one passageway segment with a passage frequency that is a low or zero passage frequency.

Description:
TECHNICAL FIELD 
     The present technology relates to an information processing apparatus, route navigator, an information processing method, and a computer program product and particularly relates to an information processing apparatus, route navigator, method and computer program product with which it is possible to search for a route where a passage frequency is low. 
     BACKGROUND ART 
     In recent years, vehicle installment-type or portable-type navigation terminals have been widely used. Among mobile phone devices and so-called smart phones too, one having a positioning function that can be used as the navigation terminal exists. 
     CITATION LIST 
     Patent Literature 
     
         
         PTL 1: Japanese Unexamined Patent Application Publication No. 2005-31071 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     For a situation where the navigation terminal is used, the navigation terminal is often used for a route search from a fixed location to a fixed destination, for instance, from home to a company, or from the company to home. Therefore, if the same navigation terminal is regularly used, a similar route is regularly searched, and a guidance of the same route is eventually given. 
     The present technology has been made in view of the above-mentioned circumstances and aims at searching for a route where a passage frequency is low. 
     Solution to Problem 
     In one embodiment, an information processing apparatus includes a processing circuit that 
     calculates respective passage frequencies of passageway segments in a passage history, and 
     selects a navigation route to a destination, includes at least one passageway segment with a passage frequency that is a low or zero passage frequency. 
     One aspect of this embodiment is that it may also include 
     a wireless interface configured to send a search query to a remote device and receive data describing the navigation route that includes the passageway segment. 
     According to another aspect, the passageway segment is a road. 
     According to another aspect, the passageway segment is at least one of a pedestrian path and a sidewalk. 
     According to another aspect, the passageway segment is a bicycle path. 
     According to another aspect, the processing circuit sets a predetermined area that includes a current position and a destination, and selects the navigation route to be within the predetermined area. 
     According to another aspect, a size of the predetermined area is expanded to in accordance with a user-specified extra-time input. 
     According to another aspect, the processing circuit selects the navigation route to coincide with a user-selectable location of interest. 
     According to another aspect, the processing circuit selects the navigation route to coincide with a location of interest, the location of interest is selected from website provided information. 
     According to another aspect the apparatus may include 
     a movement mode detection unit that detects one of a plurality of user movement modes; and 
     a storage device that stores the passage history for each of the plurality of user movement modes, wherein 
     the processing circuit calculates the passage frequency based on the passage history for respective of the plurality of user movement modes. 
     According to another embodiment, route navigator, includes 
     a search unit configured to selectably perform navigation searches in a first mode and a second mode, 
     when operating in the first mode, the search unit identifies a navigation route that includes a passageway segment that is not included in another navigation route identified with the second mode and has a passage frequency that is below a predetermined threshold, 
     when operating in the second mode, the search unit identifies the another navigation route according to a priority of at least one of a shortest distance and a shortest travel time; and 
     a display control circuit that displays the navigation route when the search unit is operating in the first mode. 
     According to one aspect of this embodiment, the route navigator may further include a wireless interface configured that sends a search query to a remote device, and receive data describing the navigation route that includes the passageway segment. 
     According to another aspect, the passageway segment is a road. 
     According to another aspect, the passageway segment is at least one of a pedestrian path and a sidewalk. 
     According to another aspect, the passageway segment is a bicycle path. 
     According to another aspect, the passage history is zero. 
     According to another aspect, the search unit sets a predetermined area that includes a current position and a destination, and selects the navigation route to be within the predetermined area. 
     According to another aspect, when operating in the first mode, a size of the predetermined area is expanded to in accordance with a user-specified extra-time input. 
     According to another aspect, the search unit selects the navigation route to coincide with a user-selectable location of interest. 
     According to another aspect, the search selects the navigation route to coincide with a location of interest, the location of interest is selected from website provided information. 
     According to another aspect the route navigator may further include a movement mode detection unit that detects one of a plurality of user movement modes; and 
     a storage device that stores the passage history for each of the plurality of user movement modes, wherein 
     the search unit calculates the passage frequency based on the passage history for respective of the plurality of user movement modes. 
     According to a method embodiment, the method includes 
     calculating with a processing circuit respective passage frequencies of passageway segments in a passage history, and 
     selecting a navigation route to a destination, includes at least one passageway segment with a passage frequency that is a low or zero passage frequency. 
     According to one aspect of the method, the method may also include 
     selectably performing with a search unit navigation searches in a first mode and a second mode, 
     when operating in the first mode, identifying a navigation route that includes a passageway segment that is not included in another navigation route identified with the second mode and has a passage frequency that is below a predetermined threshold, 
     when operating in the second mode, the identifying the another navigation route according to a priority of at least one of a shortest distance and a shortest travel time; and 
     displaying with a display control circuit the navigation route when the search unit is operating in the first mode. 
     According to a non-transitory computer storage medium embodiment, the storage medium has instructions stored therein that when executed by a processing circuit perform an information processing method, the method comprising: 
     calculating with the processing circuit respective passage frequencies of passageway segments in a passage history, and 
     selecting a navigation route to a destination, includes at least one passageway segment with a passage frequency that is a low or zero passage frequency. 
     Advantageous Effects of Invention 
     According to the present technology, it is possible to search for the route where the passage frequency is low. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  illustrates an external appearance configuration example of an information processing terminal according to an embodiment of the present technology. 
         FIG. 2  illustrates a display example of a route of a search result. 
         FIG. 3  is a block diagram illustrating a hardware configuration example of the information processing terminal. 
         FIG. 4  is a block diagram illustrating a function configuration example of the information processing terminal. 
         FIG. 5  is a block diagram illustrating a configuration example of an information processing unit of  FIG. 4 . 
         FIG. 6  illustrates an example of search-use information. 
         FIG. 7  is a flow chart for describing a passage history accumulation processing of the information processing terminal. 
         FIG. 8  is a flow chart for describing a learning processing of the information processing terminal. 
         FIG. 9  is a flow chart for describing a route search processing of the information processing terminal. 
         FIG. 10  is a flow chart for describing a cost calculation processing performed in step S 23  of  FIG. 9 . 
         FIG. 11  is a diagram for describing a cost calculation. 
         FIG. 12  is a diagram for describing an exception condition determination. 
         FIG. 13  is another diagram for describing the exception condition determination. 
         FIG. 14  illustrates a configuration example of a communication system. 
         FIG. 15  is a block diagram illustrating a configuration example of the information processing unit. 
         FIG. 16  is a block diagram illustrating a configuration example of hardware of a search server. 
         FIG. 17  is a block diagram illustrating a function configuration example of the search server. 
         FIG. 18  is a flow chart for describing a passage history transmission processing of the information processing terminal. 
         FIG. 19  is a flow chart for describing a passage history management processing of the search server. 
         FIG. 20  is a flow chart for describing a search result display processing of the information processing terminal. 
         FIG. 21  illustrates a configuration example of an external appearance of a mobile phone device. 
         FIG. 22  is a block diagram illustrating a configuration example of the mobile phone device. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments for implementing the present technology will be described. The description will be given in the following order. 
     1. First Embodiment (an example in which a route search is carried out on an information processing terminal side) 
     2. Second Embodiment (an example in which a route search is carried out on a server side) 
     &lt;First Embodiment&gt; 
     &lt;Configuration of Information Processing Terminal&gt; 
       FIG. 1  illustrates an external appearance configuration example of an information processing terminal according to an embodiment of the present technology. 
     An information processing terminal  1  of  FIG. 1  is a PND (Portable Navigation Device) and has a casing with a size at which a user can hold by one hand. A display unit  2  composed of LCD (Liquid Crystal Display) or the like is provided on a front face of the casing of the information processing terminal  1 . For example, a touch panel is layered and provided on the display unit  2 , and a button or the like displayed on the display unit  2  can be directly operated by the user with a finger. 
     The information processing terminal  1  has a GPS (Global Positioning System) function and performs a positioning of its own terminal to display a position of its own terminal on a map displayed on the display unit  2 . Also, in a case where a destination is set and a search for a route (path) to the destination is instructed, the information processing terminal  1  performs the search and displays the route decided by the search on the map. 
     A member with which the information processing terminal  1  can be fixed to a cradle  3  is provided on a back face of the casing of the information processing terminal  1 . The user can attach the information processing terminal  1 , for example, to the cradle  3  that is fixed to a dashboard of an automobile by a suction disc  3 A and detach the information processing terminal  1  from the cradle  3  to bring out. 
     For the cradle of the information processing terminal  1 , in addition to the cradle  3  which is an automobile-use cradle, a plurality of cradles such as a bicycle-use cradle are prepared. When attached to the cradle, for example, the information processing terminal  1  is electrically connected to the cradle and detects to which cradle the information processing terminal is attached on the basis of an ID or the like read out from the cradle. For use cases of the information processing terminal  1 , the user may take along the information processing terminal  1  and move on foot and attach the information processing terminal  1  to the bicycle-use cradle and move by bicycle. Also, the user may attach the information processing terminal  1  to the automobile-use cradle and move by automobile. 
     Hereinafter, mainly, the case will be described in which a movement mode of the user is on foot, by bicycle, or by automobile, but the mode in which the user brings about the information processing terminal  1  and moves is not limited to the movement on foot, the movement by bicycle, or the movement by automobile. 
     The information processing terminal  1  having the above-mentioned external appearance configuration accumulates and manages histories of passageways, such as sidewalks, pedestrian walking/running paths, bicycle trails or roads, passed by the user on foot, by bicycle, or by automobile for each movement mode. A memory inside the information processing terminal  1  respectively stores the history of the roads passed on foot, the history of the roads passed by bicycle, and the history of the roads passed by automobile. 
     When a search for a route from a current position to a destination is instructed, the information processing terminal  1  preferentially selects a road where a passage frequency is low on the basis of the passage history in accordance with the current movement mode of the user and decides the route to the destination. The road where the passage frequency is low includes not only a road where the number of passages is small but also a road which has not been passed. The route to the destination decided while the road where the passage frequency is low is preferentially selected is displayed on the display unit  2  to be presented to the user. 
       FIG. 2  illustrates a display example of the route decided while the road where the passage frequency is low is preferentially selected. 
     In the example of  FIG. 2 , a map in a predetermined range is displayed on the display unit  2 , and at a location corresponding to the current position of the information processing terminal  1 , an icon I 1  representing the current position of the information processing terminal  1  is displayed. Also, at a location corresponding to the destination set by the user, an icon I 2  representing the destination is displayed. 
     Also, among routes connecting the current position with the destination, the route decided while the road where the passage frequency is low is preferentially selected is displayed by a solid line arrow # 1 . A route represented by a broken line arrow # 2  is a route composed of a road with a high passage frequency, and a route represented by a broken line arrow # 3  is a route with a shortest distance. It is also possible to set that he route composed of the road with the high passage frequency and the shortest distance route are not displayed on the display unit  2 . 
     According to this, the user can check the road where the passage frequency is low, and while moving by following the displayed route, it is possible to go to the destination by using a road different from the usual road. By using the road different from the usual road, the user can encounter fresh discoveries along the road and be familiar with an area along the road. 
     It should be noted that icons I 11 , I 12 , and I 13  illustrated along the route with the low passage frequency in  FIG. 2  are icons respectively representing a location of a cake shop, a location of a monument, and a location of a park. These icons are displayed while the location of the cake shop, the location of the monument, and the location of the park are previously registered by the user. Also, for example, text data such as a posting to a bulletin board is obtained from a Web server, and these icons are displayed in accordance with an inclusion of information on the cake shop, the monument, and the park in the obtained text data. 
     That is, for the search for the route, appropriately, not only the passage frequency, but also the locations registered by the user, the locations posted to the bulletin board, and the like are taken into account. A route search taking into account these pieces of information will be described below. 
       FIG. 3  is a block diagram illustrating a hardware configuration example of the information processing terminal  1 . 
     The information processing terminal  1  is composed by connecting an operation input unit  12 , an output unit  13 , a position detection unit  14 , a sensor unit  15 , a communication unit  16 , an attachment detachment detection unit  17 , and a storage unit  18  to a computation processing unit  11 . 
     The computation processing unit  11  is composed by connecting a CPU (Central Processing Unit)  31 , a ROM (Read Only Memory)  32 , a RAM (Random Access Memory)  33 , a non-volatile memory  34 , and an interface unit  35  via a bus. The CPU  31  loads programs from the ROM  32  and the non-volatile memory  34  to be executed by using the RAM  33  to control an overall operation of the information processing terminal  1 . 
     The non-volatile memory  34  is a memory that is rewritable and also can hold data even when a supply from a power source is interrupted. The non-volatile memory  34  is composed of an SRAM (Static Random Access Memory) where the power source is backed up by a battery, a flash memory, or the like. 
     The interface unit  35  functions as an interface between respective units connected to the computation processing unit  11 . The control information with respect to the respective units from the CPU  31  and the information with respect to the CPU  31  from the respective units are transmitted and received via the interface unit  35 . 
     The operation input unit  12  detects operations by the user with respect to a switch provided to the casing of the information processing terminal  1  and the touch panel layered on the display unit  2  and outputs the information representing the contents of the operations by the user to the computation processing unit  11 . Also, the operation input unit  12  receives a signal from a remote controller and outputs the information representing the contents of the operations by the user with respect to the remote controller to the computation processing unit  11 . An audio input with respect to a microphone or the like and an input of an image by a camera or the like may be detected by the operation input unit  12 . 
     The output unit  13  is composed of the display unit  2  and a speaker  41 . The display unit  2  displays the map and the route of the search result to be presented to the user while following the control by the computation processing unit  11 . 
     In a case where the route of the search result is presented to the user instead of the image display, the speaker  41  outputs a sound for notifying of the route of the search result while following the control by the computation processing unit  11 . 
     The position detection unit  14  receives radio waves from the GPS and detects the position of the information processing terminal  1 . Instead of using the radio waves from the GPS, the positioning may be carried out by using radio waves from a base station of the mobile phone device, radio waves from an access point of a wireless LAN (Local Area Network), or the like. 
     The sensor unit  15  is composed of a sensor such as a gyro sensor, an acceleration sensor, or a vibration sensor. Information detected by the sensor unit  15  is output to the computation processing unit  11  and used for a correction on the location detected by the position detection unit  14  or the like. 
     The communication unit  16  performs a communication with an apparatus on a network such as a LAN or the interne via a radio transmission such as Bluetooth (trademark) or a wireless LAN. The information processing terminal  1  may be connected to an external apparatus via a fixed line such as a USB (Universal Serial Bus) cable. 
     The attachment detachment detection unit  17  detects a state of the attachment of the information processing terminal  1  with respect to the cradle. Also, the attachment detachment detection unit  17  detects to which cradle the attachment is made. Information on a detection result by the attachment detachment detection unit  17  is supplied to the computation processing unit  11 . 
     The state of the attachment with respect to the cradle may be detected on the basis of a change in a power source voltage when connected to a terminal provided to a joining part with the cradle, or a switch may be provided to the joining part with the cradle and the attachment may be mechanically detected. Also, a handle for transport may be provided to the casing of the information processing terminal  1 , and the state of the attachment may be detected on the basis of whether the handle is stored or not. For example, in a case where the handle is stored, the attachment to the cradle is detected. A type of the attached cradle is detected, for example, on the basis of the ID read out from the cradle when attached to the cradle as described above. 
     The storage unit  18  is composed of a flash memory, a hard disc, or the like and stores information on map data and the passage history. The storage unit  18  also stores POI (Point Of Interest) information which is information on a building, a shop, a park, and the like on the map, search information, music contents, video contents, and the like. 
       FIG. 4  is a block diagram illustrating a function configuration example of the information processing terminal  1 . At least a part of function units illustrated in  FIG. 4  is realized while a predetermined program is executed by the CPU  31  of  FIG. 3 . 
     A user interface unit  51  obtains the information supplied from the operation input unit  12  to be output to an information processing unit  52 . Also, the user interface unit  51  obtains the information supplied from the attachment detachment detection unit  17  to be output to the information processing unit  52  and also causes an attachment detachment state storage unit  53  to store information representing the attachment detachment state with respect to the cradle. 
     Furthermore, on the basis of the information supplied from the information processing unit  52 , a menu processing unit  54 , and a character display processing unit  56 , the user interface unit  51  controls a display of the display unit  2 . For example, information on the map and information on the route of the search result are supplied from the information processing unit  52 . Also, information on a menu screen is supplied from the menu processing unit  54 . Information on a character input by the user is supplied from the character display processing unit  56 . 
     The menu processing unit  54  is composed of a vehicle installment-use menu processing unit  54 A and a household-use menu processing unit  54 B. When a display of a vehicle installment-use menu screen is instructed by the user in a case where the information processing terminal  1  is attached to the automobile-use cradle, the vehicle installment-use menu processing unit  54 A outputs information on the vehicle installment-use menu screen to the user interface unit  51  to be displayed on the display unit  2 . Whether the information processing terminal  1  is attached to the automobile-use cradle or not is identified on the basis of the information stored in the attachment detachment state storage unit  53 . 
     When a display of a menu screen is instructed by the user in cases other than the case where the information processing terminal  1  is attached to the automobile-use cradle, the household-use menu processing unit  54 B outputs information on the menu screen to the user interface unit  51  to be displayed on the display unit  2 . Different menu screens are displayed, for example, in a case where the information processing terminal  1  is attached to the automobile-use cradle and in the other cases. 
     A character input processing unit  55  is composed of a vehicle installment-use character input processing unit  55 A and a household-use character input processing unit  55 B. When an input of a character is requested by the user in a case where the information processing terminal  1  is attached to the automobile-use cradle, the vehicle installment-use character input processing unit  55 A causes the input of the character by displaying an input column for the character on the display unit  2  or the like. The input of the character by the user is carried out at the time of the search for the location or the like. 
     When the input of the character is requested by the user in cases other than the case where the information processing terminal  1  is attached to the automobile-use cradle, the household-use character input processing unit  55 B causes the input of the character by displaying the input column for the character on the display unit  2  or the like. Different input columns for the character are displayed, for example, in a case where the information processing terminal  1  is attached to the automobile-use cradle or in other cases. 
     The character display processing unit  56  is composed of a vehicle installment-use character display processing unit  56 A and a household-use character display processing unit  56 B. When the character is input by the user in a case where the information processing terminal  1  is attached to the automobile-use cradle, the vehicle installment-use character display processing unit  56 A outputs information on the character input by the user to the user interface unit  51  to be displayed on the display unit  2 . 
     When the character is input by the user in cases other than the case where the information processing terminal  1  is attached to the automobile-use cradle, the household-use character display processing unit  56 B outputs the information on the character input by the user to the user interface unit  51  to be displayed on the display unit  2 . 
       FIG. 5  is a block diagram illustrating a configuration example of the information processing unit  52  of  FIG. 4 . 
     The information processing unit  52  is composed of a movement mode detection unit  71 , a history management unit  72 , a history storage unit  73 , a passage frequency calculation unit  74 , a registration information/attention information obtaining unit  75 , a search-use information storage unit  76 , a search unit  77 , a map data storage unit  78 , and a display control unit  79 . The history storage unit  73 , the registration information/attention information obtaining unit  75 , and the map data storage unit  78  are realized, for example, in the storage unit  18 . The history storage unit  73 , the registration information/attention information obtaining unit  75 , and the map data storage unit  78  may also be realized in storage units other than the storage unit  18  such as a storage unit on the server and removable media mounted to the information processing terminal  1 . 
     The information representing the attachment detachment state with respect to the cradle detected by the attachment detachment detection unit  17  is input from the user interface unit  51  to the movement mode detection unit  71 . Also, the information on the current position obtained through the positioning by the position detection unit  14  is input from the user interface unit  51  to the history management unit  72  and the search unit  77 . The information representing the content of the operation by the user detected by the operation input unit  12  is input from the user interface unit  51  to the registration information/attention information obtaining unit  75  and the search unit  77 . 
     The movement mode detection unit  71  determines a movement mode of the user on the basis of the information representing the attachment detachment state with respect to the cradle detected by the attachment detachment detection unit  17 . For example, in a case where the information processing terminal  1  is not attached to the cradle, the movement mode detection unit  71  determines that the movement mode of the user is on foot, and in a case where the information processing terminal  1  is attached to the bicycle-use cradle, it is determined that the movement mode of the user is by bicycle. Also, in a case where the information processing terminal  1  is attached to the automobile-use cradle, the movement mode detection unit  71  determines that the movement mode of the user is by car. 
     The movement mode detection unit  71  outputs the information representing the determined movement mode of the user to the history management unit  72  at the time of the accumulation of the passage history. Also, the movement mode detection unit  71  outputs the information representing the determined movement mode of the user to the search unit  77  at the time of the search for the route. 
     The history management unit  72  obtains the information representing the movement mode of the user supplied from the movement mode detection unit  71  and the information on the current position detected by the position detection unit  14  in a predetermined cycle when the user moves while carrying about the information processing terminal  1 . The history management unit  72  performs a matching with the map data stored in the map data storage unit  78  or the like to detect a road through which the user is currently passing and stores information on the passed road in the history storage unit  73  as a passage history for each movement mode of the user. The information on the passed road which is stored as the passage history includes not only identification information as to which road is passed but also information on a gradient of the road. 
     The history storage unit  73  stores the passage history for each movement mode. The passage history also includes information on a time at which the user passes through each road. 
     The passage frequency calculation unit  74  reads out the passage history for each movement mode from the history storage unit  73  and calculates the passage frequency of each road on the basis of the passage history. The passage frequency calculation unit  74  stores the information on the passage frequency of each road in the search-use information storage unit  76  for each movement mode. 
     The registration information/attention information obtaining unit  75  identifies a favorite location of the user on the basis of the operation by the user with respect to the operation input unit  12 . A registration of the favorite location is carried out, for example, when the user selects a predetermined location on the map displayed on the display unit  2 . The registration information/attention information obtaining unit  75  stores the information on the identified favorite location of the user in the search-use information storage unit  76 . The information on the favorite location includes position information on the favorite location and the information representing a degree of liking registered by the user. 
     Also, the registration information/attention information obtaining unit  75  controls the communication unit  16  to access the Web server and downloads and obtains the text data. For example, in a case where the Web server is a server for managing the bulletin board, the text data posted in the bulletin board is obtained. 
     The registration information/attention information obtaining unit  75  extracts names of the building, the shop, the park, and the like by analyzing the obtained text data. The registration information/attention information obtaining unit  75  identifies a location attracting attention from people who have posted among the locations such as the building, the shop, and the park which are placed on the map stored in the map data storage unit  78 . Also, the registration information/attention information obtaining unit  75  obtains an attention degree of the identified attention location, for example, on the basis of the number of inclusions of the name of the same location in the text data. The registration information/attention information obtaining unit  75  stores the information on the attention location including the position information on the attention location and the information on the attention degree in the search-use information storage unit  76 . 
     The search-use information storage unit  76  stores the information on the passage frequency of each road calculated by the passage frequency calculation unit  74  and the information on the favorite location and the information on the attention location supplied from the registration information/attention information obtaining unit  75  as the search-use information which is information used for searching for the route. The search-use information also includes information on each road on the map. 
       FIG. 6  illustrates an example of search-use information stored in the search-use information storage unit  76 . 
     The search-use information includes road information D 1 , road connection information D 2 , user information D 3 , neighborhood information D 4 , and traffic information D 5 . Information other than the information illustrated in  FIG. 6  may also be included in the search-use information. Also, a part of information among the information illustrated in  FIG. 6  may also be used for carrying out the route search. 
     The road information D 1  includes a length of each road on the map, a width of each road, a type of each road such as a national road, a prefectural road, a minor street, or a toll road, a road structure of each road such as whether it is a service road or not, a gradient of each road, and information on a state of each road such as whether it is a paved road or an unpaved road. 
     The road connection information D 2  includes information representing a right-turn road or a left-turn road with regard to each road, information on the presence or absence of an intersection, information on the presence or absence of a level crossing, and information on the presence or absence of a traffic signal. 
     The user information D 3  includes the information on the passage frequency of each road for each movement mode, the information on the favorite location, and the information on the attention location. The information on the passage frequency included in the user information D 3  is registered by the passage frequency calculation unit  74 , and the information on the favorite location and the information on the attention location are registered by the registration information/attention information obtaining unit  75 . 
     The neighborhood information D 4  includes the information on the shop on the map and the information on the park. 
     The traffic information D 5  includes information on the presence or absence of the generation of traffic jam, the presence or absence of the generation of a traffic accident, and the presence or absence of the generation of a passage prohibition. 
     While referring back to the description of  FIG. 5 , in a case where a predetermined position on the map is set as the destination by the user and the search for the route from the current position to the destination is instructed, in accordance with the search mode, the search unit  77  reads out predetermined information from the search-use information storage unit  76 . The search mode includes a mode for carrying out the search for the route including the road different from the usual road and a mode for carrying out a normal search in priority to a distance or in priority to a time. 
     For example, in a case where the conduct of the search for the route including the road different from the usual road is instructed, the search unit  77  reads out the entire search-use information of  FIG. 6  including the information on the passage frequency. Also, in a case where the conduct of the normal search is instructed the search unit  77  reads out information at least except for the information on the passage frequency among the search-use information of  FIG. 6 . That is, the information on the passage frequency is used for the route search in a case where the search for the route including the road different from the usual road is carried out. 
     The search unit  77  performs the search for the route from the current position to the destination on the basis of the information read out from the search-use information storage unit  76 . For an algorithm of the route search, for example, Dijkstra method of obtaining a cost of each route from the current position to the destination and select a route with a low cost is used. Other search algorithms such as A-star method may also be used. It should be noted that the current position is identified on the basis of the location detected by the position detection unit  14 . The search unit  77  outputs the information on the route of the search result to the display control unit  79 . 
     The map data storage unit  78  stores the map data and the POI information. 
     In a case where the information on the route of the search result is supplied from the search unit  77 , the display control unit  79  reads out the map data in a range including the route of the search result from the map data storage unit  78  and generates screen information illustrated in  FIG. 2  where the route of the search result is displayed on the map. The display control unit  79  outputs the generated screen information to the user interface unit  51  and causes the display unit  2  to display the route of the search result. 
     &lt;Operation of Information Processing Terminal&gt; 
     Herein, an operation by the information processing terminal  1  will be described. First, with reference to a flow chart of  FIG. 7 , a processing of the information processing terminal  1  that accumulates the passage history will be described. 
     The processing of  FIG. 7  is repeatedly carried out, for example, when the power source of the information processing terminal  1  is turned ON and the user uses the information processing terminal  1 . When the power source of the information processing terminal  1  is turned ON, the positioning is carried out by the position detection unit  14  to detect the current position. 
     In step S 1 , the movement mode detection unit  71  determines the movement mode of the user on the basis of the information supplied from the attachment detachment detection unit  17 . 
     In step S 2 , the history management unit  72  identifies a road through which the user passes on the basis of the current position detected by the position detection unit  14  and the map data stored in the map data storage unit  78 . 
     In step S 3 , the history management unit  72  stores the information on the passing road in the history storage unit  73  for each movement mode and ends the processing. The processing of  FIG. 7  is repeatedly carried out, and the passage history in a case where the movement mode is on foot, the passage history in the case of the car, and the passage history in the case of the bicycle are respectively stored in the history storage unit  73 . 
     Next, with reference to a flow chart of  FIG. 8 , a learning processing by the information processing terminal  1  will be described. The processing of  FIG. 8  is carried out at a predetermined timing each time the passage history is stored in the history storage unit  73  or the like. 
     In step S 11 , the passage frequency calculation unit  74  reads out the information on the passage history for a predetermined movement mode from the history storage unit  73 . 
     In step S 12 , the passage frequency calculation unit  74  performs the learning of the passage history read out from the history storage unit  73  to calculate the passage frequency of each road. 
     In step S 13 , the passage frequency calculation unit  74  stores the information on the passage frequency obtained through the calculation in the search-use information storage unit  76  and ends the processing. 
     Next, with reference to a flow chart of  FIG. 9 , a processing of the information processing terminal  1  for performing the route search will be described. The processing of  FIG. 9  is started, for example, when a predetermined position on the map is set as the destination by the user and the search for the route from the current position to the destination is instructed. 
     After the destination is set, a menu screen used for settings with regard to the search is displayed on the display unit  2 . By using the menu screen, the user can perform various settings regard to the search such as a selection to perform the search for the route including the road different from the usual road and a selection to avoid the toll road. Information representing the selected contents by the user is detected by the operation input unit  12  and supplied to the search unit  77 . 
     In step S 21 , the search unit  77  determines whether or not the search for the route including the road different from the usual road is carried out. 
     In a case where it is determined in step S 21  that the search for the route including the road different from the usual road is performed, in step S 22 , the search unit  77  reads out the search-use information including the information on the passage frequency in accordance with the movement mode from the search-use information storage unit  76 . For example, in a case where the movement mode detection unit  71  determines that the movement mode of the user is on foot, the search-use information storage unit  76  reads out the search-use information including the information on the passage frequency learnt on the basis of the passage history on foot from the search-use information storage unit  76 . 
     In step S 23 , the search unit  77  performs a cost calculation processing. A cost of an arbitrary route to the destination is calculated through the cost calculation processing. 
     Herein, with reference to a flow chart of  FIG. 10 , the cost calculation processing performed in step S 23  of  FIG. 9  will be described. 
     In step S 41 , the search unit  77  obtains setting information related to the calculation of the cost among the settings by the user with regard to the search. The selection to avoid the toll road and the like become the settings related to the calculation of the cost. 
     In step S 42 , the search unit  77  sets weights on the respective parameters of the search-use information and calculates the cost of the arbitrary route. 
       FIG. 11  is a diagram for describing the cost calculation. An edge indicated by an arrow corresponds to one road, and nodes on both ends of the edge correspond to two points connected by the road. A direction of the arrow indicating the edge represents a direction in which the passage can be made. A node corresponding to the current position is set as the node A, and a node corresponding to the destination is set as a node J. 
     In this case, first, the respective costs of the nodes between A-B, the nodes between A-C, the nodes between A-D, the nodes between A-D-C, and the nodes between A-C-B which are routes to the nodes B, C, and D which are locations adjacent to the node A are calculated. 
     For example, the cost between the nodes A-B can be obtained in the following manner by using the respective parameters of  FIG. 6 . The parameter of the road information D 1  and the parameter of the road connection information D 2  are the parameter related to a road A-B which is a road connecting the locations corresponding to the node A and the node B. Weights w by which the respective parameters are multiplied are changed in accordance with the setting information obtained in step S 41  or the like.
 
Cost between the nodes  A - B =(length of the road)× w 11+(width of the road)× w 12+(type of the road)× w 13+(structure of the road)× w 14+(gradient of the road)× w 15+(state of the road)× w 16+(left right turn)× w 21+(intersection)× w 22+(the presence or absence of the level crossing)× w 23+(the presence or absence of the traffic signal)× w 24+(passage frequency)× w 31+(favorite location)× w 32+(attention location)× w 33+ . . .
 
     In this example, since the conduction of the search for the route including the road different from the usual road is instructed, the information on the passage frequency is also used in the cost calculation. The other parameters illustrated in  FIG. 6  are also appropriately used in the calculation of the cost between the nodes A-B. The weighting may also be carried out on parameters such as a time and consumed calorie other than the parameters illustrated in  FIG. 6  and used for the calculation of the cost. 
     The weight w 31  by which the parameter of the passage frequency is multiplied becomes a larger value as the passage frequency of the road A-B is higher and becomes a smaller value as the passage frequency is lower. According to this, in a case where the parameter of the passage frequency is used for the cost calculation, the obtained cost becomes larger as the passage frequency is higher and becomes smaller as the passage frequency is lower. According to this, a route including a road where a passage frequency is low becomes more likely to be searched for. 
     The weights w by which the respective parameters are multiplied are changed by the movement mode of the user. For example, in a case where the movement mode is on foot, the weight w 12  by which a parameter of the width of the road A-B is multiplied is set to be smaller than that in the case where the movement mode is on foot or by bicycle. According to this, in a case where the movement mode is on foot, a route including a narrow road becomes more likely to be searched for. 
     Also, in a case where the movement mode is on foot, the weight w 15  by which the parameter on the gradient of the road A-B is multiplied is set to be larger than that in the case where the movement mode is on foot or by bicycle. According to this, in a case where the movement mode is on foot, a route including a road with a large gradient becomes more unlikely to be searched for. 
     Similarly, also in a case where the movement mode is by bicycle, the weight w 12  by which the parameter of the width of the road the road A-B is set to be smaller than that in the case where the movement mode is on foot or by bicycle. According to this, in a case where the movement mode is by bicycle, a route including a narrow road becomes more likely to be searched for. 
     Also, in a case where the movement mode is by bicycle, the weight w 15  by which the parameter on the gradient of the road A-B is multiplied is set to be larger than that in the case where the movement mode is on foot or by bicycle. According to this, in a case where the movement mode is by bicycle, a route including a road with a large gradient becomes more unlikely to be searched for. 
     On the basis of the information on the gradient of the road included in the passage history, a determination is made on to which extent of the gradient the user can pass for each movement mode, and the weight w 15  by which the parameter of the gradient of the road is set, so that it is also possible to carry out the route search. For example, in a case where the movement mode is on foot or by bicycle, the weight w 15  becomes larger than the case where the movement mode is on foot or by bicycle. 
     In this manner, in the information processing terminal  1 , it is possible to carry out the search for the route while taking into account the width of the road and the gradient of the road in accordance with the movement mode. 
     For the parameter of the favorite location, for example, a predetermined value such as “1” is set in a case where the favorite location registered by the user exists in a predetermined range while a location on the straight line connecting the current position with the destination is set as a reference and is used for the cost calculation. For the weight w 32  by which the parameter of the favorite location is multiplied, a larger value is set as the favorite location is closer to the reference location or the degree of liking is larger. In a case where the favorite location is registered by the user but the location does not exist in the predetermined range, “0” is set as the value of the parameter of the favorite location and is not used for the cost calculation. 
     For the parameter of the attention location, for example, in a case where the attention location exists within a predetermined range while the straight line connecting the current position with the destination is set as the reference, a predetermined value such as “1” is set and is used for the cost calculation. For the weight w 33  by which the parameter of the attention location is multiplied, a larger value is set as the attention location is closer to the reference location or a degree of attention is larger. In a case where the attention location does not exist within the predetermined range, “0” is set as the value of the parameter of the attention location and is not used for the cost calculation. 
     In the example of  FIG. 11 , it is obtained in a manner that the cost between the nodes A-B is 10, the cost between the nodes A-C is 20, the cost between the nodes A-D is 8, and the cost between the nodes A-D-C is 13 (8+5). In this case, routes from the node 
     A toward the node C include the route between the nodes A-C and the route between the nodes A-D-C, but the route between the nodes A-C where the cost is large is removed from the candidate, and the route between the nodes A-D-C remains as the candidate. By repeatedly carrying out the above-mentioned cost calculation, the search unit  77  obtains the cost of each route. 
     For example, in a case where the calculation for the cost for an arbitrary route from the current position to the destination such as the nodes A-D-C-F-I-J is carried out, while returning back to step S 23  of  FIG. 9 , the subsequent processing is carried out. 
     In step S 24 , the search unit  77  determines whether or not the route where the cost has been calculated is relevant to the exceptional condition. 
       FIG. 12  is a drawing for describing the determination on the exceptional condition. As illustrated in  FIG. 12 , while a position P 11  is set as the current position and a position P 12  is set as the destination, a case will be described in which a route from the position P 11  to the position P 12  is searched for. 
     In this case, for example, the search unit  77  sets an elliptic area having a straight line obtained by extending a straight line # 11  connecting the position P 11  with the position P 12  by a predetermined length as a major axis as an area A 1 . The area A 1  includes the current position and the destination. 
     The search unit  77  determines a route out of the area A 1  as a route relevant to the exceptional condition. It may be determined to be relevant to the exceptional condition in a case where a part of the roads constituting the entire route exceeds the area A 1 , and also it may be determined to be relevant to the exceptional condition in a case where a road having a distance at a predetermined rate with respect to the distance of the entire route exceeds the area A 1 . According to this, it is possible to prevent a search for a route where a distance to the destination becomes too far. Furthermore, the user may choose to expand the area A 1  if the user has more available time to reach the destination. For example, the user may choose to input “extra-time” available to the user so that the user can possibly explore more locations of interest that would fall within the area A 1 . Moreover, if the user decides he has more extra time to reach the destination, the user may select a broader area A 1  so the user can experience new routes and locations of interest along unfamiliar passageway segments. 
     In accordance with a situation of the learning on the passage frequency, the area functioning as the reference of the determination on the exceptional condition may be changed as illustrated in  FIG. 13 . In the example of  FIG. 13 , the area A 1  of  FIG. 12  is expanded as indicated by arrows # 21  and # 22  to be extended to a range of an area A 2 . As the information amount on the passage history becomes larger and the learning on the passage frequency progresses, by setting the elliptic area functioning as the reference of the determination on the exceptional condition to be large, it is possible to expand the range of the route including the road different from the usual road. 
     While returning back to the description of  FIG. 9 , in a case where it is determined in step S 24  that the route where the cost has been calculated is relevant to the exceptional condition, in step S 25 , the search unit  77  performs the recalculation of the cost. 
     The recalculation of the cost is realized by changing the setting on the weight so that the cost of the route determined to be relevant to the exceptional condition becomes high and performing a processing similar to the processing of  FIG. 10 . Finally, since the route where the total of the costs of the respective roads constituting the route is low is selected as the search result, the route relevant to the exceptional condition becomes unlikely to be selected as the search result. In a case where it is determined in step S 24  that the route where the cost has been calculated is not relevant to the exceptional condition, the processing in step S 25  is skipped. 
     In step S 26 , the search unit  77  determines whether or not a search end condition is satisfied. For example, in a case where the calculation for the cost for a predetermined number of routes is ended, it is determined that the search end condition is satisfied. In a case where it is determined in step S 26  that the search end condition is not satisfied, the search unit  77  returns to step S 23  and calculates a cost of another route from the current position to the destination. 
     On the other hand, in a case where it is determined in step S 26  that the search end condition is satisfied, in step S 27 , the search unit  77  decides the route having the lowest total of the costs of the respective roads constituting the route as the search result. The search unit  77  outputs information representing the decided route of the search result to the display control unit  79 . 
     In step S 28 , the display control unit  79  displays the map in a predetermined range on the display unit  2  on the basis of the data stored in the map data storage unit  78  and displays the route of the search result on the displayed map. It should be noted that the icons representing the locations of the cake shop, the monument, and the park illustrated in  FIG. 2  are stored, for example, in the map data storage unit  78 . 
     At the time of the display of the route of the search result, information on the rate of the roads different from the usual road (roads having a lower passage frequency than a threshold) among the entire roads constituting the route of the search result may be displayed. 
     Also, a color of the road different from the usual road may be displayed in a different color from a color of the road having a higher passage frequency than the threshold, or the width of the road different from the usual road may be displayed in a width different from the width of the road having the higher passage frequency than the threshold. According to this, the user can easily check the road different from the usual road. 
     On the other hand, in a case where it is determined in step S 21  that the search for the route including the road different from the usual road is not carried out, in step S 29 , the search unit  77  performs a normal route search without using the learning data. The normal route search is the same as the above-mentioned search except for a point that the information on the passage frequency among the search-use information is not used for the route search. 
     The route that becomes the search result is decided in step S 27  on the basis of the costs of the respective routes obtained through the normal search and is displayed on the display unit  2  in step S 28 . 
     Through the above-mentioned processing, the user can check the road where the passage frequency is low and can go to the destination by moving by following the displayed route with use of the road different from the usual road. 
     Also, the user does not have to examine the route using the road different from the usual road by itself, and it is possible to avoid the trouble. In a case where the route using the road different from the usual road is examined by itself, the user has to relay on memories and perform an operation of considering which road the user has not passed through by itself and setting a via point, but it is possible to avoid such trouble. The time taken by checking the route using the road different from the usual road can be shortened, and it is possible to improve the usability of the user. 
     Since the processings of  FIG. 7  to  FIG. 9  are repeatedly carried out, the information processing terminal  1  also starts guiding a side road having a low passage frequency and a narrow width which the user may not remember. According to this, from the viewpoint of presenting the route using the road different from the usual road, it is possible to improve the quality of the guided route. 
     In a case where the user examines the route using the road different from the usual road by itself, the route of the examination result may become an unrealistic route going a long way round, but the above-mentioned circumstance can be avoided by carrying out the determination on the exceptional condition. Also, by accumulating the passage history for each movement mode of the user and carrying out the route search while taking into account the passage frequency for each movement mode, the information processing terminal  1  can guide the route including the road different from the usual road for each movement mode. 
     &lt;Second Embodiment&gt; 
     &lt;Configuration of Communication System&gt; 
       FIG. 14  illustrates a configuration example of a communication system. 
     The communication system of  FIG. 14  is constructed by connecting the information processing terminal  1  with a search server  101  via a network  102 . 
     In the communication system of  FIG. 14 , transmission and reception of various pieces of information are carried out between the information processing terminal  1  and the search server  101 , and the search for the route using the road different from the usual road or the like is carried out by the search server  101 . A plurality of terminals having a configuration similar to the information processing terminal  1  are connected to the search server  101  via the network  102 . 
     That is, at the time of the accumulation of the passage history by the user, the information processing terminal  1  determines the movement mode of the user and transmits the information on the movement mode and the information on the current position to the search server  101 . 
     The search server  101  receives the information transmitted from the information processing terminal  1  and manages the passage history of the user of the information processing terminal  1  for each movement mode. Also, the search server  101  calculates and manages the passage frequency of each road by the user of the information processing terminal  1 . 
     In a case where the search for the route to the predetermined destination is requested from the information processing terminal  1 , while following the request from the information processing terminal  1 , the search server  101  performs the search for the route as described with reference to  FIG. 9 . The search server  101  transmits the information on the route of the search result to the information processing terminal  1  to be displayed on the display unit  2  of the information processing terminal  1 . 
     In this manner, it can also be set that the route search taking the passage frequency of the user of the information processing terminal  1  or the like into account is carried out in the search server  101 . 
     &lt;Configurations of Respective Apparatuses&gt; 
       FIG. 15  is a block diagram illustrating a configuration example of the information processing unit  52  that the information processing terminal  1  of  FIG. 14  has. A hardware configuration of the information processing terminal  1  of  FIG. 14  is the same as the configuration of  FIG. 3 . In the information processing terminal  1 , a movement mode detection unit  111 , an obtaining unit  112 , and a search result obtaining unit  113  are realized while predetermined programs are executed by the CPU  31 . 
     At the time of the accumulation of the passage history or at the time of the search for the route, similarly as in the movement mode detection unit  71  of  FIG. 5 , the movement mode detection unit  111  determines the movement mode of the user on the basis of the attachment detachment state with respect to the cradle which is detected by the attachment detachment detection unit  17 . The movement mode detection unit  111  outputs the information representing the determined movement mode of the user to the obtaining unit  112 . 
     The obtaining unit  112  obtains the information supplied from the movement mode detection unit  111  at the time of the accumulation of the passage history and the information on the current position detected by the position detection unit  14  when the user moves while carrying about the information processing terminal  1 . The obtaining unit  112  controls the communication unit  16  and transmits the information representing the movement mode of the user and the information on the current position to the search server  101 . 
     Also, at the time of the search for the route, the obtaining unit  112  obtains the information supplied from the movement mode detection unit  111 , the information on the current position detected by the position detection unit  14 , and the information on the destination set by the user. The obtaining unit  112  transmits the information on the current position and the information on the destination together with the information on the movement mode and the information on various settings related to the search to the search server  101  and requests the search for the route. The settings related to the search include, for example, information for instructing the search for the route using the road different from the usual road. 
     The search result obtaining unit  113  controls the communication unit  16  and obtains the information on the search result transmitted from the search server  101 . By con-trolling the user interface unit  51  or the like, the search result obtaining unit  113  displays the route of the search result on the display unit  2  to be presented to the user. 
       FIG. 16  is a block diagram illustrating a configuration example of hardware of the search server  101 . 
     A CPU  121 , a ROM  122 , and a RAM  123  are mutually connected by a bus  124 . 
     An input output interface  125  is further connected to the bus  124 . An input unit  126  composed of a key board and a mouse and an output unit  127  composed of a display, a speaker, and the like are connected to the input output interface  125 . Also, a storage unit  128  composed of a hard disc, a non-volatile memory, or the like, a communication unit  129  that is composed of a network interface or the like and performs a communication with the information processing terminal  1  via the network  102 , and a drive  130  for driving removable media  131  are connected to the input output interface  125 . 
       FIG. 17  is a block diagram illustrating a function configuration example of the search server  101 . In the search server  101 , while a predetermined program is executed by the CPU  121  of  FIG. 16 , a part of the configuration illustrated in  FIG. 5  is realized. 
     In the search server  101 , an obtaining unit  141 , a history management unit  142 , a history storage unit  143 , a passage frequency calculation unit  144 , an attention information obtaining unit  145 , a search-use information storage unit  146 , a search unit  147 , a map data storage unit  148 , and a transmission control unit  149  are realized. 
     The history management unit  142  corresponds to the history management unit  72  of  FIG. 5 , and the history storage unit  143  corresponds to the history storage unit  73  of  FIG. 5 . The passage frequency calculation unit  144  corresponds to the passage frequency calculation unit  74  of  FIG. 5 , and the attention information obtaining unit  145  corresponds to the registration information/attention information obtaining unit  75  of  FIG. 5 . The search-use information storage unit  146  corresponds to the search-use information storage unit  76  of  FIG. 5 , the search unit  147  corresponds to the search unit  77  of  FIG. 5 , and the map data storage unit  148  corresponds to the map data storage unit  78  of  FIG. 5 . A redundant description will be appropriately omitted. 
     The obtaining unit  141  controls the communication unit  129  and obtains the information transmitted from the information processing terminal  1 . At the time of the accumulation of the passage history, the obtaining unit  141  outputs the information representing the movement mode of the user and the information on the current position transmitted from the information processing terminal  1  to the history management unit  142 . Also, at the time of the search for the route, the obtaining unit  141  outputs the information representing the movement mode of the user, the information on the current position, the information on the destination, and the information on the setting transmitted from the obtaining unit  141  to the search unit  147 . 
     The history management unit  142  obtains the information representing the movement mode of the user and the information on the current position supplied from the obtaining unit  141 . The history management unit  142  identifies the road through which the user of the information processing terminal  1  passes by carrying out the matching with the map data stored in the map data storage unit  148  or the like and stores the information on the passed road as the passage history in the history storage unit  143  for each movement mode. 
     The history storage unit  143  stores the passage history of the user of the information processing terminal  1  for each movement mode. The passage history also includes information on the times at which the user has passed the respective road and identification information of the information processing terminal  1 . 
     At the time of the learning on the passage frequency of the user of the information processing terminal  1 , the passage frequency calculation unit  144  reads out the passage history for each movement mode of the user of the information processing terminal  1  from the history storage unit  143  to calculate the passage frequency of each road. The passage frequency calculation unit  144  stores the information on the passage frequency of each road in the search-use information storage unit  146  for each movement mode. 
     The attention information obtaining unit  145  controls the communication unit  129  to access the Web server and downloads and obtains text data. The attention information obtaining unit  145  identifies the attention location by analyzing the obtained text data. The attention information obtaining unit  145  stores the information on the attention location including the position information on the attention location and the information on the attention degree in the search-use information storage unit  146 . 
     The search-use information storage unit  146  stores the information on the passage frequency of each road calculated by the passage frequency calculation unit  144  and the information on the attention location supplied from the attention information obtaining unit  145  as the search-use information. The search-use information includes the information illustrated in  FIG. 6 . 
     In a case where the information representing the movement mode of the user of the information processing terminal  1 , the information on the current position, the information on the destination, and the information on the setting of the route search are supplied from the obtaining unit  141 , in accordance with the search mode, the search unit  147  reads out predetermined information from the search-use information storage unit  146 . On the basis of the information read out from the search-use information storage unit  146 , the search unit  147  performs the search for the route to the destination as described with reference to  FIG. 9 , for example. The search unit  147  outputs the information on the route of the search result to the transmission control unit  149 . 
     The map data storage unit  148  stores the map data and the POI information. 
     In a case where the information on the route of the search result is supplied from the search unit  147 , the transmission control unit  149  reads out the map data in a range including the route of the search result from the map data storage unit  148  and generates information on a screen where the route of the search result is displayed on the map. The transmission control unit  149  transmits the generated screen information to the information processing terminal  1  and displays the route of the search result on the display unit  2 . 
     The map data may be prepared in the information processing terminal  1 . In this case, only the information on the route of the search result is transmitted from the search server  101 , and in the information processing terminal  1  receiving it, the route of the search result is displayed on the map. 
     &lt;Operations of Respective Apparatuses&gt; 
     Herein, operations of the information processing terminal  1  of  FIG. 14  and the search server  101  will be described. First, with reference to a flow chart of  FIG. 18 , the processing of the information processing terminal  1  that transmits the passage history will be described. 
     In step S 101 , the movement mode detection unit  111  of the information processing terminal  1  ( FIG. 15 ) determines the movement mode of the user on the basis of the information supplied from the attachment detachment detection unit  17 . 
     In step S 102 , the position detection unit  14  performs the positioning to detect the current position. 
     In step S 103 , the obtaining unit  112  transmits the information representing the movement mode of the user and the information on the current position to the search server  101  and ends the processing. 
     Next, with reference to a flow chart of  FIG. 19 , a processing of the search server  101  that manages the passage history of the user of the information processing terminal  1  will be described. The processing of  FIG. 19  is carried out in accordance with the conductance of the processing of  FIG. 18  in the information processing terminal  1 . 
     In step S 111 , the obtaining unit  141  of the search server  101  ( FIG. 17 ) obtains the information representing the movement mode of the user and the information on the current position transmitted from the information processing terminal  1 . 
     In step S 112 , the history management unit  142  identifies the road through which the user of the information processing terminal  1  passes on the basis of the information on the current position obtained by the obtaining unit  141 . The history management unit  142  stores the passage history of the user of the information processing terminal  1  for each movement mode in the history storage unit  143  and ends the processing. 
     While the processings in  FIG. 18  and  FIG. 19  are repeatedly carried out, the history storage unit  143  of the search server  101  respectively stores the passage history in a case where the movement mode is on foot, the passage history in the case of the car, and the passage history in the case of the bicycle. 
     Next, with reference to a flow chart of  FIG. 20 , a processing of the information processing terminal  1  that displays the result of the route search will be described. The processing of  FIG. 20  is started, for example, after the destination is set by the user and the setting on the route search is carried out. 
     In step S 121 , the movement mode detection unit  111  of the information processing terminal  1  determines the movement mode of the user on the basis of the information supplied from the attachment detachment detection unit  17 . 
     In step S 122 , the position detection unit  14  performs the positioning to detect the current position. 
     In step S 123 , the obtaining unit  112  transmits the information on the movement mode of the user and the information on the current position together with the information on the destination, the information on the setting related to the search, and the like to the search server  101  and requests the route search. In the search server  101  receiving the request from the information processing terminal  1 , a processing basically similar to the processing described with reference to  FIG. 9  is carried out. When the route search is ended, the information including the route of the search result is transmitted from the search server  101 . 
     In step S 124 , the search result obtaining unit  113  obtains the information transmitted from the search server  101 . 
     In step S 125 , the search result obtaining unit  113  displays the map including the route of the search result on the display unit  2  to be presented to the user. Through the above-mentioned processing too, the user of the information processing terminal  1  can check the road where the passage frequency is low and can go to the destination with use of the road different from the usual road by moving while following the displayed route. 
     It should be noted that the determination on the movement mode of the user may also be carried out in the search server  101 . A configuration of a part of the configuration illustrated in  FIG. 17  can also be provided to the information processing terminal  1 . 
     &lt;Modified Examples&gt; 
     In the above, the passage frequency of each road is calculated on the basis of the passage history, but the calculated passage frequency is reset at a predetermined timing, and the passage frequency may also be recalculated by using the passage history within a predetermined latest period of time. 
     According to this, with regard to the road where a certain period of time has elapsed since the passage, the passage frequency thereof can be decreased, and a route including the road where the user has not passed for a while can be more likely to be searched for. 
     Also, in the above, the movement mode of the user is determined on the basis of the attachment state of the cradle, but of course, the user may input the movement mode to the information processing terminal  1  by itself. The movement mode of the user may also be determined on the basis of the sensor data detected by the vibration sensor of the sensor unit  15 . 
     In this case, in the information processing terminal  1 , sensor data detected when moved on foot, sensor data detected when moved by car, and sensor data detected when moved by bicycle are prepared. While the matching between a characteristic of the previously prepared sensor data and a characteristic of the sensor data detected by the sensor unit  15  is carried out, the movement mode of the user is determined. 
     The route search taking the passage frequency into account is carried out in the information processing terminal  1  that is the PND or the search server  101 , but the route search taking the passage frequency into account can be applied to various apparatuses. For example, it is possible to carry out the above-mentioned route search taking the passage frequency into account in a vehicle installment-use apparatus, a mobile phone device, a digital camera, and a personal computer having a navigation function. 
       FIG. 21  illustrates an external appearance configuration example of the mobile phone device that performs the route search taking the passage frequency into account. 
     Similarly as in the information processing terminal  1 , a mobile phone device  201  of  FIG. 21  has a casing with a size at which the user can hold by one hand. A display unit  202  composed of an LCD or the like is provided on a front face of a casing of the mobile phone device  201 . 
     The mobile phone device  201  has a GPS function and can perform the positioning of a position of its own terminal. The mobile phone device  201  displays the position of its own terminal on a map displayed on the display unit  202  and displays a route decided through the search on the map in a case where the destination is set and the search for the route to the destination is instructed. 
     In the vicinity of the display unit  202  on the casing front face of the mobile phone device  201 , a speaker  205 , a microphone  204 , and an operation unit  206  composed of various buttons are provided. On a casing back face of the mobile phone device  201 , a member for allowing the mobile phone device  201  to be fixed to a cradle  203  is provided. 
       FIG. 22  is a block diagram illustrating a configuration example of the mobile phone device  201 . 
     A mobile phone unit  210  of the mobile phone device  201  is composed of the microphone  204 , the speaker  205 , a transmission reception unit  211 , a decoder  212 , a mobile phone control unit  214 , and an encoder  215 . 
     At the time of a phone call, the microphone  204  collects voice of the user and outputs a voice signal to the encoder  215 . 
     While following a control by the mobile phone control unit  214 , the encoder  215  performs an encode on the voice signal supplied from the microphone  204  and outputs voice data obtained by the encode to the transmission reception unit  211 . 
     The transmission reception unit  211  transmits the voice data supplied from the encoder  215  to an external base station from an antenna AP and causes a terminal of a call party to transmit. Also, when the voice data is transmitted from the terminal of the call party via the base station, the transmission reception unit  211  receives the voice data to be output to the decoder  212 . 
     While following a control by the mobile phone control unit  214 , the decoder  212  decodes the voice data and outputs the voice from the speaker  205 . 
     The mobile phone control unit  214  detects the operation by the user with respect to the operation unit  206  and controls the overall operation of the mobile phone device  201 . For example, the mobile phone control unit  214  controls the respective units of the mobile phone unit  210  to realize the call function and also displays the screen illustrated in  FIG. 2  on the display unit  202  on the basis of information supplied from an overall control unit  209 . 
     A storage unit  208  is composed of a flash memory and stores various pieces of information supplied from the mobile phone control unit  214 . 
     The overall control unit  209  outputs information supplied from a navigation unit  220  to the mobile phone control unit  214  and conversely outputs information supplied from the mobile phone control unit  214  to the navigation unit  220 . From the navigation unit  220 , for example, the information on the screen representing the result of the route search is supplied to the overall control unit  209 , and from the mobile phone control unit  214 , the information representing the content of the operation by the user for performing the route search is supplied to the overall control unit  209 . 
     The navigation unit  220  is composed of the computation processing unit  11 , the position detection unit  14 , the sensor unit  15 , the attachment detachment detection unit, the storage unit  18  of  FIG. 3 , and the like. In the navigation unit  220 , the respective configurations of  FIG. 4  and  FIG. 5  are realized, and the above-mentioned route search taking the passage frequency of the user into account is carried out. 
     In this manner, the route search taking the passage frequency of the user into account can be applied to various apparatuses. 
     The above-mentioned series of processings can be executed by hardware and can also be executed by software. In a case where the series of processings are executed by the software, a program constituting the software is installed into a computer incorporated in dedicated-use hardware, a general-use personal computer, or the like. 
     The installed program is recorded on the removable media  131  illustrated in  FIG. 16  composed of an optical disc (a CD-ROM (Compact Disc-Read Only Memory), a DVD (Digital Versatile Disc), or the like), a semiconductor memory, or the like and presented. Also, it may be provided via a wired or wireless transmission medium such as a local area network, the internet, or digital satellite broadcasting. The programs can be previously installed into the ROM  122  or the storage unit  128 . 
     It should be noted that the program executed by the computer may be a program in which the processings are performed in a time-series manner in the order described in the present specification or a program in which the processings are performed in parallel or at a needful timing such as a timing when a call is performed. 
     The embodiments of the present technology are not limited to the above-mentioned embodiments, and various changes can be made within a range without departing from the gist of the present technology. 
     For example, the present technology can adopt the following configurations. 
     (1) 
     An information processing terminal including: 
     a calculation unit that calculates a passage frequency of each road on the basis of a passage history; and 
     a search unit that preferentially selects a road where the passage frequency is low and decides a route to a destination. 
     (2) 
     The information processing terminal according to the (1), further including: 
     a display unit that displays the route to the destination decided by the search unit on a map. 
     (3) 
     The information processing terminal according to the (1) or (2), further including: 
     an output unit that outputs the route to the destination decided by the search unit by way of voice. 
     (4) 
     The information processing terminal according to any one of the (1) to (3), further including: 
     a detection unit that detect a passed road; and 
     a storage unit that stores information on the road detected by the detection unit as the passage history, 
     in which the calculation unit calculates the passage frequency on the basis of the passage history stored in the storage unit. 
     (5) 
     The information processing terminal according to the (4), further including: 
     a movement mode detection unit that detects a movement mode of a user, in which the storage unit stores the passage history for each movement mode detected 
     by the movement mode detection unit, and the calculation unit calculates the passage frequency on the basis of the passage history of a predetermined movement mode. 
     (6) 
     The information processing terminal according to any one of the (1) to (5), in which the search unit sets an area including a current position and the destination and does not select a route including a road out of the set area as the route to the destination. 
     (7) 
     The information processing terminal according to the (6), 
     in which the search unit changes and sets the area in accordance with an amount of the passage history. 
     (8) 
     The information processing terminal according to any one of the (1) to (7), 
     in which the calculation unit recalculates the passage frequency on the basis of the passage history within a predetermined recent period of time, and 
     the search unit selects the route to the destination on the basis of the passage frequency recalculated by the calculation unit. 
     (9) 
     The information processing terminal according to any one of the (1) to (8), 
     in which the search unit selects the route to the destination to pass a location specified by the user of the information processing terminal. 
     (10) 
     The information processing terminal according to any one of the (1) to (9), further including: 
     an obtaining unit that obtains, from a server on a network, text data posted to a Web site managed by the server and extracts information indicating a location from the text data, 
     in which the search unit selects the route to the destination to pass the location indicated by the information extracted by the obtaining unit. 
     (11) 
     An information processing method including the steps of: 
     calculating a passage frequency of each road on the basis of a passage history; and 
     preferentially selecting a road where the passage frequency is low and deciding a route to a destination. 
     (12) 
     A program for causing a computer to execute a processing including the steps of: 
     calculating a passage frequency of each road on the basis of a passage history; and 
     preferentially selecting a road where the passage frequency is low and deciding a route to a destination. 
     REFERENCE SIGNS LIST 
       1  INFORMATION PROCESSING TERMINAL 
       2  DISPLAY UNIT 
       11  COMPUTATION PROCESSING UNIT 
       14  POSITION DETECTION UNIT 
       17  ATTACHMENT DETACHMENT DETECTION UNIT 
       52  INFORMATION PROCESSING UNIT 
       71  MOVEMENT MODE DETECTION UNIT 
       72  HISTORY MANAGEMENT UNIT 
       73  HISTORY STORAGE UNIT 
       74  PASSAGE FREQUENCY CALCULATION UNIT 
       75  REGISTRATION INFORMATION/ATTENTION INFORMATION OBTAINING UNIT 
       76  SEARCH-USE INFORMATION STORAGE UNIT 
       77  SEARCH UNIT 
       78  MAP DATA STORAGE UNIT 
       79  DISPLAY CONTROL UNIT