Patent Publication Number: US-2005137790-A1

Title: Information distribution system and information distribution method

Description:
The disclosure of Japanese Patent Applicant No. 2003-423428 filed Dec. 19, 2003 including the specification, drawings, and claims is incorporated herein by reference in its entirety.  
     BACKGROUND OF THE INVENTION  
      1. Field of Invention  
      This invention relates to an information distribution system and an information distribution method.  
      2. Description of Related Art  
      Conventional vehicle mounted navigation apparatus are designed in such a manner that, in order to obtain a destination from someplace other than the navigation apparatus, a navigation system must be used in order to download the new into the navigation apparatus. In the navigation system, a destination, which was set-up by utilizing an information terminal, is registered in an information center, and the registered destination is downloaded onto the navigation apparatus (e.g., see, JP-A-2001-148092).  
      In the above-described conventional navigation system, when an ignition switch of a vehicle is turned ON, a destination is downloaded from the information center to the navigation apparatus. However, if a large amount of information with a large data size is downloaded, it may be a long time until the download is complete. Further, if communication between the information center and the navigation apparatus has a limited communication range, for example, a wireless LAN, the navigation apparatus, and thus the vehicle, will have to remain within the limited communication range until the lengthy download is complete.  
     SUMMARY OF THE INVENTION  
      Thus, various exemplary embodiments of this invention provide an information distribution system and an information distribution method in which necessary distribution information is downloaded effectively and there is no need to wait for a lengthy download until it is possible to move a vehicle.  
      Various exemplary embodiments of this invention provide an information distribution center including a controller that searches for a route from a departure place to a destination place as a search route and searches for access points on the search route. The controller selects, based on distribution information, a first access point that can communicate with a mobile terminal apparatus when a vehicle is turned on and that corresponds to a first portion of the distribution information and selects, based on the distribution information, a second access point along the search route that corresponds to a second portion of distribution information. The controller then transmits the first portion of the distribution information to the first access point and transmits the second portion of the distribution information to the second access point.  
      Various exemplary embodiments of this invention provide a mobile terminal apparatus including a controller that transmits a request to receive distribution information from an information distribution center. The controller receives a first portion of the distribution information, including a searched route, from a first access point, the first access point capable of communicating with the mobile terminal apparatus when a vehicle is turned on. The controller receives a second portion of the distribution information from a second access point, the second access point located on the searched route.  
      Various exemplary embodiments of this invention provide a method for distributing information including searching for a route from a departure place to a destination place as a search route; searching for access points on the search route; selecting, based on distribution information, a first access point that can communicate with a mobile terminal apparatus when a vehicle is turned on and that corresponds to a first portion of the distribution information; selecting, based on the distribution information, a second access point along the search route that corresponds to a second portion of distribution information; transmitting the first portion of the distribution information to the first access point; and transmitting the second portion of the distribution information to the second access point.  
      Various exemplary embodiments of this invention provide a method for distributing information including transmitting a request to receive distribution information from an information distribution center; receiving a first portion of the distribution information, including a searched route, from a first access point, the first access point capable of communicating with the mobile terminal apparatus when a vehicle is turned on; receiving a second portion of the distribution information from a second access point, the second access point located on the searched route.  
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      Exemplary embodiments of the invention will now be described with reference to the accompanying drawings, wherein:  
       FIG. 1  is a block diagram of a navigation system according to an exemplary embodiment of the invention;  
       FIG. 2  is a view which explains a navigation apparatus according to the exemplary embodiment of the invention;  
       FIG. 3  is a flow chart which shows an operation of the navigation system according to the exemplary embodiment of the invention;  
       FIG. 4  is a view which explains an operation of access point judgment processing in the mode for carrying out this invention;  
       FIG. 5  is a view which explains an operation of data size calculation processing according to the exemplary embodiment of the invention;  
       FIG. 6  is a first view which shows an operation on the occasion of obtaining distribution information according to the exemplary embodiment of the invention; and  
       FIG. 7  is a second view which shows the operation on the occasion of obtaining distribution information according to the exemplary embodiment of the invention. 
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS  
       FIG. 1  is a block diagram of a navigation system according to an exemplary embodiment of this invention.  
      As shown in  FIG. 1 , the navigation system can include a navigation apparatus  14  as a mobile terminal apparatus and as an on-board terminal mounted on a vehicle, a hot spot  45 , and a personal computer  61  as a user terminal. The system can also include an information center  62  as an information provider. The navigation apparatus  14  and the personal computer  61  may be connected through a wireless LAN (not shown), and the navigation apparatus  14  and the hot spot  45  may be connected through a wireless LAN  44 . The hot spot  45 , the personal computer  61 , and the information center  62  may be connected through a network  43 . Thus, the navigation system may include the navigation apparatus  14 , the network  43 , the wireless LAN  44 , the hot spot  45 , the personal computer  61 , the information center  62 , and so on.  
      The information center  62  may be equipped with a communication part  63  and a center controller group  64 . The center controller group  64  can be equipped with various controllers such as a WEB controller  51 , a POI (facility information) controller  52 , a route search controller  53 , a map controller  54 , and an access point controller  55 . The center controller group  64  can also include a POI memory  56 , a search memory  57 , a map memory  58 , and an access point memory  59  that are respectively connected to the POI controller  52 , the route search controller  53 , the map controller  54 , and the access point controller  55 . The above-described controllers can each include a control device such as, for example, a CPU, and/or an MPU, a recording device such as, for example, a hard disk, and an internal recording device, such as, for example, a RAM, a ROM, and/or a flash memory.  
      The above-described memories, which record navigation information, may be configured by databases. It should be appreciated that according to this exemplary embodiment, the WEB controller  51  is always connected to, foe example, the WWW (World Wide Web), and can open a site for providing various information to a controller (e.g., a server) of a predetermined provider through the network  43 .  
      The navigation apparatus  14  may be equipped with, for example, a navigation controller  17 , a memory  16  as a data recording part, and a communication part  38 .  
      According to this exemplary embodiment, the personal computer  61  is placed at a reference spot, e.g., a home of an operator, and may be equipped with a CPU  71  as a controller, a display part  72  as a notification device that notifies various information to an operator, an operation part  73 , a memory  74  as a data recording part, and/or a communication part  75 . The communication part  75  can include a modem (not shown), for connecting the personal computer  61  to the information center  62 , and/or an access point (not shown), for connecting the personal computer  61  to the navigation apparatus  14  by the wireless LAN through the communication part  38 .  
      The hot spot  45  can be, for example, a restaurant, a store, or any other place having an access point (not shown) that is capable of receiving signals from the communication part  38  across the wireless LAN  44  to connect the navigation apparatus  14  to the network  43 .  
      According to this exemplary embodiment, the navigation apparatus  14  is used as a mobile terminal. However, according to various other exemplary embodiments, it is also possible to use any other device that can be connected to the wireless LAN  44 , and which can carry out interactive communication, such as, for example, an electronic notebook, a portable telephone, a portable terminal, a PDA (personal digital assistant), and/or a television telephone. Also, according to this exemplary embodiment, the personal computer  61  is a user terminal. However, according to various other exemplary embodiments, it is possible to use, for example, a home server, and/or any other device that can be connected to the network  43 , and which can carry out interactive communication, such as an electric notebook, a portable telephone, a portable terminal, a PDA, and/or a television telephone.  
      Furthermore, according to this exemplary embodiment, as a controller, the CPU  71  is used. According to various other exemplary embodiments, it is also possible to use, for example, an MPU as a substitute for the CPU  71 . As the display part  72 , it is possible to use, for example, a display as a CRT display, a liquid crystal display, and/or a plasma display.  
      As the operation part  73 , it is possible to use, for example, a keyboard, a mouse, and/or a touch panel that is formed on the above-described display. It is also possible to use, for example, a bar code reader, a remote control device for remote operation, a joy stick, a light pen, and a stylus pen. In the above-described touch panel, an operation part area such as various keys, switches, and buttons may be formed on the display, and by touching (depressing) the operation part area, it is possible to carry out an input.  
      For the memory  74 , it is possible to use, for example, a RAM, a ROM, a flash memory, and/or a hard disk. In addition, as substitute for the hard disk, it is also possible to use, for example, a flexible disc, a magnetic tape, a magnetic drum, a CD-ROM, a CD-R, a MD, a DVD, an optical disc, a MO, an IC card, an optical card, and/or a memory card. In addition, in order to use the hard disk, a reading device for reading out data recorded in the hard disk, and a writing device for recording data may be included in the memory  74 .  
      In addition to the, for example, navigation apparatus  14 , the personal computer  61 , and the center controller group  64 , servers of the network provider function as a computer on the basis of a predetermined program, data and so on, respectively, independently, or in combination of 2 or more.  
      In the POI memory  56 , the search memory  57 , the map memory  58 , and the access point memory  59 , various data is stored such as, for example, facility data regarding various facilities, search data for searching a route and sound output data for outputting a search result by an audio output part (not shown), of the navigation apparatus  14 , map data for displaying maps, and a position, a range in which communication is possible, a communication speed and so on as to each access point.  
      The map data may include, for example, road data that represents information of each road (road link), intersection data which represents information of each intersection, and/or node data which represents information of a node point which was set along each road. The facility data may include data which represents facilities such as, for example, hotels, gas stations, and parking lots, in, for example, each district.  
      The information center  62  is capable of receiving general information such as news, weather forecasts, and electronic communications. The information center  62  may also receive traffic information that can include congestion information, restriction information, parking lot information, traffic accident information, congestion at service areas, that is transmitted from a traffic information transmission center as an information provider, e.g., VICS (registered trademark) (Vehicle Information and Communication System) center (not shown). The information center  62  is further able to receive, for example, image information of a television program, or music information of a music program and so on. In addition to general information transmitted from a broadcasting station, for example, a content provider may send various distribution information of the traffic information, general information, image information, music information and so on to the personal computer  61  or the navigation apparatus  14  through the network  43 , in a data format of, for example, text data, sound data, image data and so on.  
      Also, in the center controller group  64 , a statistical data controller (not shown) may be connected to a statistical memory (not shown). The statistical memory can store statistical data as history information. The statistical data may include processed data that is obtained by applying predetermined processing to, for example, past traffic information, and/or general information as well as past traffic information, and/or general information that are recorded chronologically.  
      Furthermore, in the center controller group  64 , there may be a mail controller (not shown), a personal information controller (not shown), a personal information memory (not shown) that is connected to the personal information controller and can record personal data of, for example, schedules set by an operator, as well as a mail memory (not shown) that can record transmission data, reception data, and so on which were transmitted and received by the mail controller.  
      The network  43  can include one or more communication line networks such as, for example, the Internet, a LAN (Local Area Network), a WAN (Wide Area Network), an intranet, a portable telephone line network, a telephone line network, a public communication line network, and/or an exclusive communication line network. In addition, it is also possible to use as part of the network  43  a non-stop automatic fee payment system (ETC), and/or a narrow band communication system (DSRC) that are utilized in an advanced road traffic system (ITS). CS broadcasting by a broadcasting satellite, BS broadcasting, terrestrial digital television broadcasting, FM multiplex broadcasting may also make up part of the network  43 .  
      The navigation apparatus  14  of the above-described configuration will be described with reference to  FIG. 2 .  
      As shown in  FIG. 2 , the navigation apparatus  14  can include a GPS sensor  15  as a present location detector that detects a present location of a vehicle, a memory  16  in which various data is recorded, a navigation controller  17  that carries out, for example, various arithmetic processing on the basis of information inputted, a direction sensor  18  as a direction detecting part that detects a direction of the vehicle, an operation part  34  as a first input part, a display part  35  as a first notification part that notifies various information to an operator, an audio input part  36  as a second input part, an audio output part  37  as a second notification part which notifies various information to an operator, and/or a communication part  38 . A vehicle speed sensor  39  may be connected to the navigation controller  17 .  
      The navigation controller  17  can include a CPU  31  as a control device which carries out control within the navigation apparatus  14 , a RAM  32  that is used as a working memory on the occasion that the CPU  31  carries out various arithmetic processing, and/or a ROM  33  that can store various programs for carrying out a search for a route, and/or route guidance up to a destination place. The navigation controller  17  may also include, in addition to a program for control, a flash memory (not shown) as a recording medium for, for example, downloading and recording data which was transferred from the personal computer  61 . In addition, according to various other exemplary embodiments, it is also possible to use, for example, an MPU in addition to, or instead of, the CPU  31 . The CPUs  31 ,  71 , the navigation controller  17 , and/or the CPUs and/or the MPUs of each controller in the center controller group  64  can function as a computer.  
      The memory  16  may be, for example, a hard disk and may be equipped with a recording head as a driver for reading, for example, a predetermined program and/or data that are recorded in the hard disk, and/or writing predetermined data in the hard disk.  
      According to this embodiment, the hard disk is used as the memory  16 . According to various other exemplary embodiments as substitute for the hard disk, it is possible to use, for example, a RAM, a ROM, a flash memory, and/or a hard disk. In addition, as substitute for the hard disk, it is also possible to use, for example, a flexible disc, a magnetic tape, a magnetic drum, a CD-ROM, a CD-R, a MD, a DVD, an optical disc, a MO, an IC card, an optical card, and/or a memory card. In order to use the hard disk, a reading device for reading out data recorded in the hard disk, and a writing device for recording data may be included in the memory  74 .  
      According to this exemplary embodiment, various programs may be recorded in the ROM  33 , and various data may be recorded in the memory  16 . According to various other exemplary embodiments, it is possible to record programs, and/or data in a hard disk, and to read out programs, and/or data and so on from the hard disk and to write them in the flash memory. Therefore, by replacing the hard disk, it is possible to update the programs, data and so on. Also, in case that an automatic transmission control device for carrying out control of an automatic transmission apparatus is mounted on the vehicle (not shown) it is possible to record a program, data and so on for controlling the automatic transmission control device, in the hard disk.  
      The operation part  34  can modify a present location of the vehicle when starting to drive, can input a departure place as a guidance starting spot and a destination place as a guidance ending spot, and can operate the communication part  38 . The operation part  34  is comprised of operation switches (not shown) such as, for example, various keys, switches, and buttons. Also, as the operation part  34 , it is possible to use a bar code reader, a remote control device for remote operation, a joy stick, a light pen, and a stylus pen. Furthermore, it is also possible to configure the operation part  34  by operation switches which are displayed as images on a display screen of a touch panel formed on a display of the display part  35 , (not shown). In that case, an input is carried out by touching the operation switch.  
      The traffic information, general information, and/or image information may be displayed on the display of the display part  35  as non-guidance information. Operation guidance, an operation menu, a guidance of keys, a search route from a present location up to a destination place, guidance information along the search route may be displayed on the display of the display part  35  as guidance information. As the display part  35 , it is possible to use, for example, a display as a CRT display, a liquid crystal display, and/or a plasma display.  
      The audio input part  36  can include, for example, a microphone (not shown) and can input necessary information by sounds. Furthermore, the audio output part  37  may be equipped with a sound synthesizing device (not shown) and a speaker, (not shown). Thus, for example, the search route, and/or the guidance information can be sound-outputted from the audio output part  37 , for example, by sounds which were synthesized by the sound synthesizing device. It is also possible to sound-output various sounds, various guidance information and so on that were sound-recorded in, for example, a tape, and/or a memory, in advance, in addition to sounds which were synthesized by the sound synthesizing device.  
      The communication part  38  can include a beacon receiver (not shown) as a first receiving device that receives the traffic information transmitted from the traffic information transmission center through, for example, a electromagnetic wave beacon device, and/or an optical beacon device that are disposed along a road, the communication part  38  can include an FM receiver (not shown) as a second receiving device that receives FM multiplex information composed of general information such as, for example, news, weather forecasts and so on through a FM broadcasting station. The beacon receiver and FM receiver may be unitized and disposed as a VICS receiver, but can also be disposed separately.  
      The navigation apparatus  14  and the personal computer  61  are connected by the wireless LAN so as to be able to carry out interactive communication. Accordingly, as described above, an access point may be disposed on the communication part  75 , and a slot (not shown) such as, for example, a PCMCIA slot, a PC card slot and so on may be formed on the communication part  38 . A wireless card can be inserted into the slot. In addition, according to this embodiment, the navigation apparatus  14  and the personal computer  61  are connected by the wireless LAN. However, according to various other exemplary embodiments, the navigation apparatus  14  and the personal computer  61  may be connected by a wired LAN. In such embodiments, a hub is disposed in the communication part  75 , and the hub and the communication part  38  are coupled by a cable in such a manner that they can be coupled and de-coupled.  
      Operation of the navigation system of the above-described configuration as an information obtaining system will be described with reference to  FIGS. 3-7 .  FIG. 3  is a flow chart which shows an operation of the navigation system according to the exemplary embodiment of this invention.  FIG. 4  is a view which explains an operation of access point judgment processing according to the exemplary embodiment of this invention.  FIG. 5  is a view which explains an operation of data size calculation processing according to the exemplary embodiment of this invention.  FIG. 6  is a first view which shows an operation on the occasion of obtaining distribution information according to the exemplary embodiment of this invention.  FIG. 7  is a second view which shows an operation on the occasion of obtaining distribution information according to the exemplary embodiment of this invention.  
      If an operator wants to obtain various distribution information including, for example, traffic information, general information, image information, and/or music information, he/she sets a departure place and a destination place using the personal computer  61  at, for example, his/her home. Accordingly, when he/she operates the operation part  73  to input the departure place and the destination place, the CPU  71  sets up the departure place and the destination place as search conditions, and transmits the search conditions to the information center  62 . The CPU  71  also transmits a distribution request for requesting distribution of the distribution information, to the information center  62 .  
      In addition, for example, when a PDA is used as substitute for the personal computer  61 , it is possible to set a GPS card in a slot such as a PCMCIA slot, a PC card slot and so on of the PDA, and to set up a present location which was detected by the GPS card, as a departure place.  
      When the search conditions and distribution request are received by the communication part  63  of the information center  62 , the route search controller  53 , for example, reads out search data from the search memory  57 , and if needed, refers to the statistical memory to read out statistical data, and reads traffic information which was transmitted from the traffic information transmission center. Thus, the route search controller  53  obtains information which is necessary for searching a route.  
      Subsequently, the route search controller  53  carries out search processing, and searches for a route (e.g., search route Rt 1 ) in accordance with the search conditions, on the basis of, for example, the search data, and if needed on the basis of the statistical data, the traffic information.  
      Because the navigation apparatus  14  is equipped with the communication part  38 , when the vehicle passes through a vicinity of the hot spot  45  (containing an access point), it connects the navigation apparatus  14  to the network  43  through the wireless LAN  44  so that it is possible to carry out communication with the information center  62 .  
      Therefore, according to this embodiment, the distribution information may be downloaded through an access point of a hot spot along the route in addition to being able to download distribution information through the communication part  75  when an ignition switch of a vehicle is turned ON, e.g., via an access point of the user&#39;s home. Accordingly, the access point controller  55 , can carry out access point search processing. When the access point controller  55  receives a distribution request, it can read out access point data from the access point memory  59 , search an access point on the search route Rt 1 , and judges whether there is an access point on the search route Rt 1 .  
      If there is an access point on the search route Rt 1 , the WEB controller  51  determines whether there is distribution information that can be downloaded. If there is distribution information which can be downloaded, the access point server  55  carries out access point selection processing, and, based on the type of distribution information, selects an access point (e.g., either the communication part  75  or an access point along the search route Rt 1 ) suitable for downloading the distribution information.  
      For example, since route guidance data for guiding the search route Rt 1  is necessary for driving a vehicle from the user&#39;s home to a destination place, it is preferable to download the route guidance data at the user&#39;s home. Therefore, the access point selection processing means selects the communication part  75  as an access point for transmitting route guidance data. The route guidance data may be composed of, for example, route data which represents the search route Rt 1 , map data which represents a map in the vicinity of the search route Rt 1 , and/or audio output data for guiding the search route Rt 1  by the sound output part  37  and represents guidance information for route guidance.  
      According to this exemplary embodiment, audio output data may be included in the route guidance data. In various other exemplary embodiments, the audio output data may be recorded in advance in the memory  16  of the navigation apparatus  14 . Thus, in those embodiments, the audio output data is not included in the route guidance data.  
      Because distribution information such as, for example, image information, and/or music information are necessary for viewing a movie, and listening to music during a trip, it is preferable to download them in the vicinity of the user&#39;s home. Therefore, for example, the access point controller  55  selects, as an access point for transmitting the, for example, image information, and/or music information, an access point in the vicinity of the user&#39;s home on the search route Rt 1  (e.g., in an area AR 1  within a range of a predetermined distance from the home as shown in  FIG. 4 ).  
      Furthermore, because distribution information such as, for example, general information, including news, weather forecasts and so on are usually not necessary until the destination is reached, it is preferable to download that general information short of the vicinity of a destination place. Therefore, the access point controller  55  selects, as an access point for transmitting the general information, any access point prior to the vicinity of a destination place on the search route Rt 1 , (e.g., in areas AR 1  and AR 2 , other than an area AR 3 , within a range of a predetermined distance from the destination place shown in  FIG. 4 ).  
      Because distribution information such as, for example, facility information of a vicinity of a destination place may be obtained at any time prior to arrival at a destination place, it is preferable that the access point controller  55  selects as an access point for transmitting facility information, any access point up to and including the vicinity of the destination place (e.g., in any areas AR 1  to AR 3  on the search route Rt 1  as shown in  FIG. 4 ).  
      Subsequently, the WEB controller  51 , carries and calculates the data size of distribution information which can be downloaded at each access point on the search route Rt 1 .  
      As shown in  FIG. 5 , in order to calculate the data size, the WEB controller  51 , for example, reads out from the access point memory  59  a range mi (i=1, 2, . . .) within which communication with each access point on the search route APi (i=1, 2, . . . ) is possible, the WEB controller  51  also reads out from the access point memory  59  a communication speed (data size per unit time) with respect to each access point APi on the search route Rt 1 . Then, the WEB controller  51  configures the search route Rt 1  with reference to the map memory  58 , and reads out, for example, a distance of a road ri (i=1, 2, . . . ), and/or a road type in each range mi in which communication is possible. Furthermore, the range mi in which communication is possible may be limited by the maximum range in which the communication part  38  can detect electromagnetic waves of wireless communication through the wireless LAN  44 .  
      The WEB controller  51  determines whether each road ri is, for example, a general road such as a city road, a prefectural road, a national road, or a motor highway such as a toll road, and an express way, and reads out an average speed of a vehicle from, for example, a RAM of the WEB controller  51 , which was set in accordance with the road type (e.g., set as 30 km/h in case of a general road, and set as 60 km/h in case of a motor highway). According to this exemplary embodiment, the average vehicle speeds recorded in the WEB controller  51  can be changed as needed.  
      Based on the distance of the road ri, the communication speed, and average vehicle speed, the WEB controller  51  calculates a data size of distribution information which can be downloaded, with respect to each access point APi along the search route Rt 1 .  
      The WEB controller  51  carries out distribution information determination processing and determines which distribution information will be transmitted at each access point APi, on the basis of the type of distribution information, which was assigned to each access point APi, and the data size capability of each access point APi, which was calculated in the data size calculation processing.  
      If there is any remaining distribution information which can not be transmitted at each access point APi on the search route Rt 1 , among the distribution information for which distribution requests were sent out, as described above, it may be downloaded, for example, by the personal computer  61  at the user&#39;s home. In this connection, the WEB controller  51 , for example, identifies that remaining distribution information as distribution information to be downloaded at the user&#39;s home in addition to the route guidance data.  
      The WEB controller  51  carries out transmission processing, and transmits the distribution information to be downloaded at the user&#39;s home, to the personal computer  61 . When the distribution information is transmitted by the WEB controller  51 , the CPU  71 , receives the distribution information and downloads and records the distribution information in, for example, a hard disk of the memory  74 .  
      With reference to  FIGS. 6 and 7 , when an operator (e.g., a driver), turns ON an ignition switch and activates the navigation apparatus  14  at timing t 1 , a present location is detected by the GPS sensor  15 , and a direction of the vehicle is detected by the direction sensor  18 .  
      In the personal computer  61 , the CPU  71  reads out the distribution information from, for example, the hard disk of the memory  74 , and transmits it to the navigation apparatus  14 . Correspondingly, in the navigation apparatus  14 , the CPU  31  downloads and records the distribution information in, for example, the hard disk of memory  16 . In this manner, when the predetermined distribution information is completely downloaded, it is possible to start to drive a vehicle at timing t 2 .  
      Then, the CPU  31  reads out route guidance data among the distribution information, from, for example, the flash memory, and on the basis of the route guidance data, forms a map screen on the display part  35 . The CPU  31  displays a present location, displays a map in the vicinity of the present location, displays a direction of the vehicle in the map screen, displays the search route Rt 1  in the vicinity of the present location, and notifies the search route Rt 1  to a driver with, for example, an audio message via audio output part  37 . Accordingly, a user can drive a vehicle in accordance with the present location which was displayed on the map screen or audibly notified, the neighboring map, the direction of the vehicle and the search route Rt 1 .  
      When the vehicle enters the range mi, it becomes possible for the communication part  38  to detect electromagnetic waves of wireless communication through the wireless LAN  44 . The CPU  31  determines whether an access point APi was found based on whether the communication part  38  has detected electromagnetic waves of wireless communication through the wireless LAN  44 . When an access point APi is found, the CPU  31  carries out communication processing, and in the range mi in which communication is possible, accesses the access point APi, thereby connecting the navigation apparatus  14  to the network in order to carry out communication with the information center  62 .  
      Therefore, the WEB controller  51  transmits the distribution information which is respectively assigned to each access point APi, to the navigation apparatus  14 , at a corresponding timing t 3 , t 4 , . . . tn.  
      When the distribution information is transmitted by the WEB controller  51 , the CPU  31  in the navigation apparatus  14  receives the distribution information, and subsequently, downloads and records the distribution information in, for example, a hard disk of the data recording part  16 .  
      If, as shown in  FIG. 7  there is no access point APi on the search route Rt 1 , it is not possible to download distribution information at an access point APi. Therefore, all of the distribution information which was requested for distribution, as described above, will be downloaded from the personal computer  61  at the user&#39;s home. Accordingly, in the information center  62 , the WEB controller  51  determines that all distribution information will be downloaded at the user&#39;s home. The WEB controller  51  transmits all the distribution information to the personal computer  61 . In the personal computer  61 , the CPU  71  receives the distribution information and the CPU  71  downloads and records the distribution information in, for example, a hard disk of the memory  74 .  
      Afterwards, when a user turns ON the vehicle navigation apparatus  14  by turning ON an ignition switch for driving the vehicle at timing t 11 , the CPU  71  reads out distribution information from the hard disk of the memory  74 . The CPU  71  transmits the distribution data to the navigation apparatus  14 . In the navigation apparatus  14 , the CPU  31  downloads and records the distribution information in, for example, the hard disk of the memory  16 . In this manner, when all of the distribution information is completely downloaded, it is possible to start driving of a vehicle timing t 12 .  
      If a schedule of a user is recorded in the personal information memory of the center controller group  64 , and a predetermined destination place is set in that schedule, it is possible to download the predetermined distribution information relating to that scheduled destination during an arbitrary period before the departure date. In that case, the access point controller  55  selects an access point APi for downloading the predetermined information, and the WEB controller  51  determines the predetermined distribution information to be transmitted at each access point APi, on the basis of a type of distribution information that was assigned to each access point APi in the access point selection processing, a data size of each access point APi that was calculated in the data size calculation processing.  
      Because the predetermined distribution information is not changed before the departure date, it may be distributed prior to the departure date. Distribution information that might changed before the departure date, like weather, news, event information and so on, is excluded, and distributed on the departure date.  
      The above-described process is summarized in the flow chart of  FIG. 3 . As shown in  FIG. 3 , operation begins in step S 1  where a departure place and a destination place are set at the user&#39;s home. Then, in step S 2 , a route Rt 1  is searched. Next, in step S 3 , access points APi are searched for on search route Rt 1 . In step S 4 , it is determined whether there is an access point APi on route Rt 1 . If there is an access point APi, operation continues to step S 5 . If there is not an access point, operation jumps to step S 1 . In step S 5 , it is determined whether there is distribution information to be downloaded. If there is distribution information to be downloaded, operation continues to step S 6 . If there is not distribution information to be downloaded, operation ends.  
      In step S 6 , an access point APi is selected for downloading. In step S 7 , a data size of distribution information which can be downloaded at each access point APi is calculated, and distribution information to be transmitted at each access point APi is determined. Then, in step S 8 , distribution information to be downloaded at the user&#39;s home is downloaded. In step S 9 , It is determined whether an access point APi is found while traveling the route. If the access point APi is found, operation continues to step S 10 . If the access point is not found, operation ends. In step S 10 , distribution information is downloaded, and operation returns to step S 9 . In step S 11 , after an ignition switch is turned ON, all distribution information is downloaded, and operation ends.  
      According to this exemplary embodiment, the personal computer  61  that is placed at the home of an operator, is used as a reference spot. According to various other exemplary embodiments, as substitute for the personal computer  61 , it is also possible to use, for example, a personal computer or information terminal which was placed at, for example, a working place of an operator, and/or various other facilities such as, for example, restaurants, airports, train stations, etc. According to these embodiments, on the occasion of downloading distribution information, it is possible to use a communication part of a personal computer which was placed, for example, at the working place of an operator, and/or various other facilities such as, for example, restaurants, airports, train stations, etc as an access point. Thus, the access point may be used in a similar manner as described with respect to the personal computer  61  when the ignition is turned ON.  
      According to the above-described embodiments, it is possible to effectively download necessary distribution information from an access point APi on the search route Rt 1 , during the driving of the vehicle, and therefore, it is possible to cut down on the distribution information which is required to be downloaded by the personal computer  61  at the user&#39;s home. Therefore, even if a data size of entire distribution information is large, it is possible to shorten a time between turning the ignition ON and such time that the first download is finished. As a result, it is unnecessary to wait for all of the distribution data to be downloaded, thereby allowing the vehicle to move sooner.  
      While various features of this invention have been described in conjunction with the exemplary embodiments outlined above, various alternatives, modifications, variations, and/or improvements of those features may be possible. Accordingly, the exemplary embodiments of the invention, as set forth above, are intended to be illustrative. Various changes may be made without departing from the spirit and scope of the invention.