JP2004125505A - Information delivery method, information terminal device and information delivery center - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust properly information required to be delivered from an information terminal device to an information delivery device according to the kind of communication of a communication terminal, and to fit a function and a display interface in the information terminal device to the information delivered from the information delivery device. <P>SOLUTION: A communication condition such as a communication system or a communication rate of the communication terminal 150 connected to an on-vehicle unit 100 is detected by the on-vehicle unit 100. The interface of a function display or the like to be displayed on a display monitor 119 is changed in accordance with the communication condition. When the communication system is circuit switching, the minimum service is required to a delivery center 200 so that a data capacity is reduced. When the communication system is packet switching, more service is required to the delivery center 200 compared with the case of the circuit switching. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technique for transmitting and receiving navigation data and the like between an information terminal device and an information distribution center.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a guidance information distribution center that performs a route search operation in response to a request from a moving body such as a vehicle and transmits recommended route information and guidance information to the moving body. In this case, the moving object is provided with an in-vehicle information terminal device that performs route guidance while displaying a recommended route on a monitor based on the recommended route information transmitted from the guidance information distribution center. Data is exchanged between the guidance information distribution center and the in-vehicle information terminal device via the Internet. Generally, a mobile phone is used by being connected to an in-vehicle information terminal device (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-10-255022
[0004]
[Problems to be solved by the invention]
Information transmitted from the guidance information distribution center in response to a request from the vehicle-mounted information terminal device is the same regardless of the type of communication terminal connected to the vehicle-mounted information terminal device. Therefore, depending on the communication format and communication speed of the communication terminal, the line capacity may be insufficient for the information transmitted from the guidance information distribution center, or the line capacity may not be sufficiently exhibited.
[0005]
An object of the present invention is an information distribution method, a navigation information distribution method, an information terminal device, and an information distribution center in which information requested to be distributed from the information terminal device to the information distribution center is appropriate according to the type of communication of the communication terminal. Is to provide.
[0006]
[Means for Solving the Problems]
(1) An information distribution method for transmitting and receiving various data between an information terminal device and an information distribution center by communication between an information terminal device and an information distribution center, wherein a menu condition is detected based on the detected communication condition. Is displayed on the monitor of the information terminal device, the command selected from the menu screen on the monitor is transmitted to the information distribution center, the information distribution center executes the operation according to the command, transmits the command, and is transmitted from the information distribution center. It is characterized in that the information of the calculation result that comes is displayed on a monitor.
(2) The invention according to claim 2 is the information distribution method according to claim 1, wherein the information distribution center processes the calculation result according to communication conditions and transmits the processed calculation result to the information terminal device. Features.
(3) A navigation information distribution method for exchanging at least route guidance data by communication between an in-vehicle information terminal device and an information distribution center for distributing various types of information related to vehicle operation, wherein the communication conditions are set as follows. Detects, displays a route search menu screen based on the detected communication conditions on the monitor of the information terminal device, transmits a command selected from the menu screen on the monitor to the information distribution center, and the information distribution center responds to the command. A navigation system comprising: executing a route search calculation, transmitting the route search information to an in-vehicle information terminal device, and displaying, on a monitor, route guidance information of a route search result transmitted from an information distribution center.
(4) According to a fourth aspect of the present invention, in the navigation information distribution method of the third aspect, the communication condition is any one of a communication method, a communication speed, a communication service, or a combination thereof. .
(5) In the navigation information distribution method according to the fourth aspect of the present invention, when a communication system with a high communication speed is detected, the data amount is smaller than when a communication system with a low communication speed is detected. Navigation characterized by displaying an instruction for obtaining a lot of information on a menu screen.
(6) According to the invention of claim 6, in the navigation information distribution method of claim 4, when the fixed-rate communication service is detected, the amount of data is larger than when the metered-rate communication service is detected. A command for obtaining information is displayed on a menu screen.
(7) The invention of claim 7 relates to an information terminal device used in the navigation information distribution method of claims 3 to 6. This information terminal device includes a transmitting / receiving means for transmitting / receiving various data to / from an information distribution center, a detecting means for detecting a communication condition of the transmitting / receiving means, and a communication condition of the transmitting / receiving means detected by the detecting means. Display means for displaying a menu screen, wherein the transmission / reception means receives the route guidance information, which is the calculation result performed by the information distribution center based on the command selected from the menu screen, and displays the information on the display means. Features.
(8) An information distribution center according to an eighth aspect of the present invention comprises: an arithmetic means for performing at least a route search operation based on a command transmitted from the information terminal device according to the seventh aspect; It is characterized by comprising processing means for processing for transmission in a form according to the condition, and transmission means for transmitting the route guidance information after processing to the information terminal device.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
---overall structure---
An embodiment in which an information terminal device according to the present invention is applied to a car navigation device (hereinafter, referred to as an in-vehicle device) 100 will be described with reference to FIGS. FIG. 1 shows an on-vehicle device 100 according to an embodiment, a distribution center 200 for distributing map information and route search information to the on-vehicle device 100, and various types of data for transmitting and receiving various data between the on-vehicle device 100 and the distribution center 200. 1 shows a communication terminal 150 and a mobile communication network 250. The communication terminal 150 is connected to the in-vehicle device 100 via the connection cable 140. The on-vehicle device 100 can request the distribution center 200 from the communication terminal 150 via the mobile communication network 250 from the communication terminal 150 for detailed map information, route information, guidance information, and information on the destination required for route guidance. . Then, the communication terminal 150 can receive detailed map information, route information, guidance information, information on destinations, and the like transmitted from the distribution center 200 via the mobile communication network 250. A mobile phone or a PHS is used as the communication terminal 150. In this embodiment, it is assumed that communication terminals of various communication formats and communication speeds are used by occupants. Therefore, the in-vehicle device 100 is configured to be connectable to various communication terminals. In this specification, the communication format and the communication speed are referred to as communication conditions. As will be described later, the service contents contracted with the provider when using the Internet, such as a pay-as-you-go system and a fixed-rate system, are also conditions for communication.
[0008]
FIG. 2 is a system block diagram showing the configuration of the vehicle-mounted device 100. In FIG. 2, reference numeral 111 denotes a current position detecting device for detecting the current position of the vehicle, for example, a direction sensor 111a for detecting the traveling direction of the vehicle, a vehicle speed sensor 111b for detecting the vehicle speed, and a GPS sensor 111c for detecting a GPS signal from a GPS satellite. Etc. Reference numeral 112 denotes a memory card for storing rough road map display data nationwide and received road map display data. The memory card 112 is constituted by a nonvolatile semiconductor memory, and is detachable from the vehicle-mounted device 100. A control circuit 114 controls the entire apparatus, and includes a microprocessor and its peripheral circuits. The control circuit 114 executes a control program stored in the ROM 116 using the RAM 115 as a work area to perform various controls described later.
[0009]
Reference numeral 117 denotes an input device having various switches for inputting a destination of the vehicle and the like. Reference numeral 118 denotes an image memory for storing image data to be displayed on the display monitor 119. This image data is created from road map drawing data, various graphic data, and the like. The image data stored in the image memory 118 is read out as appropriate and displayed on the display monitor 119. The display monitor 119 displays the route information and the guidance information together with the road map. Since the connection cable 140 differs depending on the type of the communication terminal 150, the connection cable 140 is exchanged and used according to the communication terminal 150.
[0010]
The in-vehicle device 100 configured as described above performs various navigations based on the vehicle position information acquired by the current position detection device 111 and each data stored in the memory card 112. For example, a road map near the vehicle position and the vehicle position are displayed on the display monitor 119, and the driver is guided based on the route information and the guidance information downloaded from the distribution center 200.
[0011]
As shown in FIG. 1, a server 201 is provided in the distribution center 200. The server 201 stores map data for route search, detailed map display data for the whole country, map data for map matching, and data on sightseeing spots and scenic spots. The server 201 performs a route guidance calculation, extracts map display data, and the like in response to a request from the vehicle-mounted device 100 based on the various data, and transmits the result to the vehicle-mounted device 100.
[0012]
According to the above configuration, when the route search request and the detailed map request are transmitted to the distribution center 200 together with the information on the current position of the vehicle, the waypoints, and the destination from the vehicle-mounted device 100, the server 201 of the distribution center 200 A route search operation is performed based on the information received from 100. Then, the recommended route information, the guidance information, and the detailed map information, which are the calculation results, are transmitted from the distribution center 200 to the vehicle-mounted device 100. The on-vehicle device 100 can perform route guidance of the vehicle based on the recommended route information and guidance information received from the distribution center 200 and the detailed map information. Also, when the request for information on the destination is transmitted from the vehicle-mounted device 100 to the distribution center 200, the server 201 of the distribution center 200 searches for the information on the destination and transmits it to the vehicle-mounted device 100. The on-vehicle device 100 can display the information on the destination received from the distribution center 200 on the display monitor 119.
[0013]
However, since the communication speed varies depending on the type of communication method of the communication terminal 150 connected to the on-vehicle device 100, the line capability may be insufficient or the line capability may not be exhibited. Therefore, in the present embodiment, the communication format for transmitting information from distribution center 200, the information content, and the function to be provided are switched according to the type of communication terminal 150 connected to in-vehicle device 100. In the vehicle-mounted device 100, the interface of the display screen is switched according to the service provided from the distribution center 200.
[0014]
――― About communication terminals ―――
There are several types of wireless communication terminals depending on the communication method and communication speed. In the present embodiment, a mobile phone or a PHS is used as a communication terminal. Communication methods include circuit switching and packet switching. In circuit switching, it takes time to establish a communication line at the time of connection. Further, if communication is interrupted, the line is disconnected, and it takes time to establish a communication line again. When used in a mobile body as in the present embodiment, the line is easily disconnected, so that it takes a lot of time to complete data transmission. Therefore, when performing communication by circuit switching in the communication terminal of the present embodiment, it is advantageous that the data capacity is smaller. Therefore, as will be described later, the information transmitted from the distribution center 200 to the vehicle-mounted device 100 by circuit switching is limited to the minimum necessary information.
[0015]
When the communication method is packet switching, transmission is performed by dividing the transmission data into packet units, and even if communication is interrupted in the middle, the time until communication resumes is short, and retransmission is started from the part where communication was interrupted. Just fine. Therefore, in the case of the present embodiment, in which communication is easily interrupted because it is used in a mobile body, it is possible to transmit a large amount of data in a short time in communication by packet switching as compared with data transmission by circuit switching. Therefore, as will be described later, more information is transmitted from the distribution center 200 to the in-vehicle device 100 by packet switching than in the case of circuit switching. In particular, in high-speed packet communication with a communication speed of 32 kbps or more, more services are provided. Also, if the communication speed increases, the time required for retransmission can be reduced even if communication is interrupted and retransmission is performed, so that the size of a transmission packet can be increased and transmission can be performed efficiently. Note that a terminal capable of packet communication can also perform communication by circuit switching. In such a case, the communication method is determined by the setting of the communication terminal performed in advance by the user.
[0016]
――― Provided service of distribution center 200 and display on in-vehicle device 100 ―――
The contents of the service provided by transmitting from the distribution center 200 to the in-vehicle device 100 will be described below. When the communication method is circuit switching, the service provided by the distribution center 200 is limited to the minimum necessary information so as to reduce the data capacity. Therefore, when the communication method is circuit switching, the services provided by the distribution center 200 are as follows.
(1) The map display data to be provided is a main road (for example, an expressway, a national road, a main local road, or a prefectural road).
(2) The guidance data provided is guidance data from the starting point to the destination along the main road.
(3) Map matching data and destination information are not provided.
[0017]
Further, the functions that can be executed by the on-vehicle device 100 and the types of information that can be requested from the on-vehicle device 100 are changed in accordance with the information provided from the distribution center 200.
(A) In the route search, the destination is set by specifying the destination by scrolling the screen, searching by facility name, and searching by telephone number.
(B) By performing a simple map matching on the guidance data, the on-vehicle device 100 performs a calculation so as to align the own vehicle position mark with the road on the map display.
(C) When the vehicle position deviates from the recommended route, the recommended route re-search is not automatically performed.
[0018]
Such switching of functions is performed by changing an interface such as a function display displayed on the display monitor 119 in accordance with the provided service. That is, the menu screen is changed according to the communication conditions. In the circuit switching method, a simple and flat menu hierarchy is used. FIGS. 3A and 3B are examples of the display screen of the display monitor 119 of the vehicle-mounted device 100 when the communication method is line switching. As for the setting of the destination in the route search, a search by a facility name and a search by a telephone number can be performed as shown in FIG.
[0019]
When the communication method is packet switching, the service provided by the distribution center 200 can have a larger data capacity than when the communication method is circuit switching. In the packet switching system, the content of services to be provided is changed depending on the communication speed. Therefore, in the case of the packet switching system having a low communication speed, the distribution center 200 provides the following services in addition to the services provided in the case of circuit switching.
(1) The map display data to be provided includes narrow streets in addition to main roads.
(2) The guidance data to be provided is guidance data from the departure point to the destination, including narrow streets in addition to main roads.
(3) Provide information on the destination.
(4) When the vehicle deviates from the recommended route based on the position information from the on-vehicle device 100, the recommended route is searched again, and the calculation result is provided.
(5) Provide traffic information on recommended routes.
[0020]
Further, the functions that can be executed by the on-vehicle device 100 and the types of information that can be requested from the on-vehicle device 100 are changed in accordance with the information provided from the distribution center 200.
(A) The destination setting in the route search is performed by specifying a destination by scrolling the screen, searching by facility name, and searching by telephone number, and in addition to a request from the user, for example, “see”, “eat”, “play”. And so on so that they can be searched.
(B) Request information on the destination.
(C) When the position of the vehicle deviates from the recommended route, a request for re-searching the recommended route is automatically performed, and the search result is displayed.
(D) Display traffic information of the recommended route.
[0021]
It is assumed that the menu screen of the display monitor 119 is multifunctional and has a larger number of menu layers than that of the line type. FIGS. 4A and 4B are examples of the display screen of the display monitor 119 when the communication method is low-speed packet switching. Menu items are hierarchized in an increasing manner. For example, in a search for a destination in a route search, as shown in FIG. 4B, a search is performed by an area or facility name from items such as "see", "eat", and "play". Can be.
[0022]
In the case of the packet switching method with a high communication speed, the service provided by the distribution center 200 can increase the data capacity as compared with the case of the packet switching with a low communication speed. Therefore, in the case of the packet switching system with a high communication speed, the distribution center 200 provides the following services in addition to the services provided in the case of packet switching with a low communication speed.
(1) The map display data to be provided includes traffic regulation information in the narrow street data. It also provides detailed data including house map data.
(2) Map matching data is also provided.
[0023]
Further, the functions that can be executed by the on-vehicle device 100 and the types of information that can be requested from the on-vehicle device 100 are changed in accordance with the information provided from the distribution center 200.
(A) Perform map matching based on the received map matching data.
(B) Enable personal home phone number search.
The menu screen displayed on the display monitor 119 is more various. FIG. 5 is an example of a display screen in the case of the packet switching system having a high communication speed. Traffic regulation information such as one-way traffic is displayed on the narrow street display.
[0024]
――― Explanation by flowchart ―――
FIG. 6 is a flowchart of the in-vehicle device 100. 6 is executed by the control circuit 114. When the accessory is turned ON (ACC ON) by the ignition key, the power of the in-vehicle device 100 is turned on, and a program for processing the in-vehicle device 100 shown in FIG. 6 is started. In step S1, the map around the vehicle position that was displayed immediately before the power of the vehicle-mounted device 100 was turned off last time is displayed as an initial screen. In step S3, the current position of the vehicle is measured. If it is determined in step S5 that the own vehicle position has been measured, the process proceeds to step S7, where the current position of the vehicle is displayed on the display monitor 119 together with a map around the vehicle position, as shown in FIG. 7, and then to step S9. move on. In FIG. 7, reference numeral 401 denotes a vehicle position mark.
[0025]
If it is determined in step S9 that the connection cable 140 is of the cdma type, the process proceeds to step S11, and the communication terminal connected to the vehicle-mounted device 100 is set as the cdma type. If it is determined in step S9 that the connection cable 140 is not of the cdma type, the process proceeds to step S13, and it is determined whether or not the connection cable 140 is of the PHS type. If it is determined that the connection cable 140 is of the PHS type, the process proceeds to step S15, and the communication terminal connected to the vehicle-mounted device 100 is set as the PHS type. If it is determined in step S13 that the connection cable 140 is not of the PHS type, the process proceeds to step S17, and the communication terminal connected to the vehicle-mounted device 100 is set as the PDC type.
[0026]
In step S19, the communication mode set by the user for communication terminal 150 is determined. If it is determined in step S19 that the communication mode is not packet communication, the screen is set to simple mode in step S21, and the blocking size is set small in step S23. If it is determined in step S19 that the communication mode is the packet communication, the communication speed is determined in step S25. If it is determined in step S25 that the communication speed is less than 32 kbps, the screen is set to the normal mode in step S27, and the blocking size is set small in step S29. If it is determined in step S25 that the communication speed is 32 kbps or more, the screen is set to the high function mode in step S31, and the blocking size is set to the standard in step S33.
[0027]
When the setting based on the communication mode and the communication speed in steps S19 to S33 is completed, the process proceeds to step S35, and a destination input waiting screen (menu screen) is displayed on the display monitor 119. In step S37, the process waits until a destination is set by a user operation. FIG. 8 shows a display on the display monitor 119 when the destination is set. The intersection 402 of the crosshair displayed on the display monitor 119 is the destination. If it is determined in step S37 that the destination has been set, the flow advances to step S39 to transmit a route search request and a request for map display data to the distribution center 200 along with the current position, the destination, the screen mode, and the blocking size.
[0028]
In step S40, it is determined whether communication with distribution center 200 has been established. If a negative determination is made in step S40, the process returns to step S39. If the determination in step S40 is affirmative, the process proceeds to step S41, and waits for the information requested by the in-vehicle device 100 to be transmitted from the distribution center 200 in step S39. When it is determined in step S41 that the information from the distribution center 200 has been received, the process proceeds to step S43, and the guidance process is started based on the received information. In step S45, it is determined whether the guidance process has been completed. If it is determined in step S45 that the guidance process has been completed, it is determined in step S47 whether the ACC is off. If it is determined in step S47 that ACC is not off, the process returns to step S3. If it is determined in step S47 that ACC is off, the program ends.
[0029]
FIG. 9 is a flowchart of a program executed by the server 201 of the distribution center 200. Upon receiving the route search request from the vehicle-mounted device 100 in step S201, the process proceeds to step S203, and it is determined whether the screen requested by the vehicle-mounted device 100 is in the simple mode. If it is determined in step S203 that the screen requested by the in-vehicle device 100 is in the simple mode, the process proceeds to step S205, and a setting is made to perform a route calculation for the simple screen mode. If it is determined in step S203 that the screen requested by the vehicle-mounted device 100 is not in the simple mode, the process proceeds to step S207, and it is determined whether the screen requested by the vehicle-mounted device 100 is in the normal mode. If it is determined in step S207 that the screen requested by the in-vehicle device 100 is in the normal mode, the process proceeds to step S209, and a setting is made to perform a route calculation for the normal screen mode. If it is determined in step S207 that the screen requested by the in-vehicle device 100 is not in the normal mode, the process proceeds to step S211 to set the path calculation for the high-function screen mode.
[0030]
In step S213, based on the route calculation settings in steps S203 to S211, route calculation is performed, map display data is extracted, and the process proceeds to step S215. In step S215, the blocking size of the transmission information requested by the vehicle-mounted device 100 is determined. If it is determined in step S215 that the in-vehicle device 100 has requested a small blocking size, the process proceeds to step S217, and the transmission blocking size is set to be small. If it is determined in step S215 that the in-vehicle device 100 has not requested a small blocking size, the process proceeds to step S217, and the transmission blocking size is set to the standard. In step S221, the route calculation result calculated in step S213 and the extracted map display data are divided into transmission blocking sizes set in steps S215 to S219 and transmitted to the vehicle-mounted device 100.
[0031]
According to the above configuration, the following operation and effect can be obtained.
(1) The menu screen is changed according to the communication conditions of the communication terminal connected to the on-vehicle device, and the available functions are switched. For example, when a communication system with a high communication speed is detected, an instruction for obtaining information with a large data amount is displayed on the menu screen as compared with when a communication system with a low communication speed is detected. Therefore, information suitable for communication conditions can be exchanged. Further, since the menu screen is suitable for the functions that can be used, the operation is simple.
(2) The information distribution center performs a route search operation according to communication conditions, and switches the data blocking size at the time of data transmission according to communication conditions. Therefore, information suitable for communication conditions can be appropriately transmitted and received.
[0032]
――― Modifications ―――
In the above-described embodiment, the service provided by the distribution center 200 is switched by switching a menu screen or the like which is an interface of the on-vehicle device 100 according to the communication method and the communication speed. You may do so. For example, if a user has subscribed to a fixed-rate billing plan for a circuit-switched communication terminal, the screen may be set to the normal mode. Also, if the user has subscribed to a pay-as-you-go price plan for a packet-switched communication terminal, the screen may be set to be in the simple mode.
[0033]
In the above-described embodiment, the communication method that can be used by one communication terminal 150 is described as one type, but is not limited thereto. When one communication terminal 150 can use a plurality of communication methods, the service to be provided may be switched depending on which communication method is used for communication.
[0034]
In the above-described embodiment, the communication conditions such as the communication method and the communication speed of the communication terminal 150 connected to the in-vehicle device 100 are determined by the in-vehicle device 100, and the service requested to the distribution center 200 is determined by the in-vehicle device 100. But not limited to this. Information regarding the communication method and communication speed of the communication terminal 150 connected to the on-vehicle device 100 may be transmitted to the distribution center 200, and the content of the service provided to the on-vehicle device 100 may be determined on the distribution center 200 side.
[0035]
In the above-described embodiment, when the communication method of the communication terminal 150 connected to the in-vehicle device 100 is line switching, the services available in the in-vehicle device 100 are limited to those in the simple mode screen. However, the services to be provided may be switched according to the level of the communication speed even in the circuit switching system.
[0036]
In the above-described embodiment and its modifications, a mobile phone or a PHS is used as the communication terminal 150, but the present invention is not limited to this. A vehicle-mounted telephone or a communication device dedicated to a vehicle-mounted device may be used. Further, the number of units connected to the vehicle-mounted device 100 is not limited to one. For example, a card-type PHS dedicated to data communication and a circuit-switched mobile phone are connected at the same time. May be used properly.
[0037]
Note that, in the above-described embodiments and modified examples, the example of the in-vehicle car navigation device has been described, but the present invention is also applicable to a portable navigation device. Also, the case where the recommended route information and the route guidance information are received from the information distribution center has been described, but the present invention can be applied to a communication type navigation device that receives only map display data. Further, the present invention can be applied to communication technology used for distribution of various information other than the navigation device.
[0038]
In the above embodiment and its modifications, the transmitting / receiving means of the information terminal device corresponds to the communication terminal 150, and the display means corresponds to the display monitor 119. The detection means is realized by a program executed by the control circuit 114. The calculation means, processing means, and transmission means of the information distribution center correspond to the server 201.
[0039]
【The invention's effect】
As described above, according to the present invention, the information requested to be distributed from the information terminal device to the information distribution center can be made appropriate according to the communication conditions of the communication terminal.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing an embodiment of an information terminal device and an information distribution device according to the present invention.
FIG. 2 is a system block diagram of the vehicle-mounted device 100 according to one embodiment of the present invention.
FIG. 3 is a diagram showing an example of display data displayed on the vehicle-mounted device 100 according to the embodiment of the present invention.
FIG. 4 is a diagram showing an example of display data displayed on the vehicle-mounted device 100 according to the embodiment of the present invention.
FIG. 5 is a diagram showing an example of display data displayed on the vehicle-mounted device 100 according to one embodiment of the present invention.
FIG. 6 is a flowchart showing an operation of the vehicle-mounted device 100 according to the embodiment of the present invention.
FIG. 7 is a diagram showing a display monitor of the vehicle-mounted device 100 according to the embodiment of the present invention, in which a road map and a current position of the vehicle are displayed.
FIG. 8 is a diagram showing a display monitor of the vehicle-mounted device 100 according to the embodiment of the present invention, in a state where a destination is set.
FIG. 9 is a flowchart of a program executed by the server 201 of the distribution center 200 according to the embodiment of the present invention.
[Explanation of symbols]
100 On-board unit 112 Memory card
114 Control circuit 115 RAM
116 ROM 119 Display monitor
140 Connection cable 150 Communication terminal
200 distribution center 201 server
250 mobile communication network

Claims (8)

In an information distribution method for exchanging various data by communication between an information terminal device and an information distribution center,
Detecting the condition of the communication,
Displaying a menu screen based on the detected communication condition on a monitor of the information terminal device;
Transmitting an instruction selected from a menu screen on the monitor to the information distribution center,
The information distribution center executes an operation according to the instruction and transmits the result,
An information distribution method, wherein information of a calculation result transmitted from the information distribution center is displayed on the monitor. The information distribution method according to claim 1,
An information distribution method, wherein the information distribution center processes an operation result according to the communication condition, and transmits the processed operation result to the information terminal device. In a navigation information distribution method for transmitting and receiving at least route guidance data by communication between an in-vehicle information terminal device and an information distribution center that distributes various information related to vehicle operation,
Detecting the condition of the communication,
A route search menu screen based on the detected communication condition is displayed on a monitor of the information terminal device,
Transmitting an instruction selected from a menu screen on the monitor to the information distribution center,
The information distribution center executes a route search operation according to the command and transmits the route search operation to the in-vehicle information terminal device,
A navigation information distribution method, comprising displaying, on the monitor, route guidance information as a route search result transmitted from the information distribution center. The navigation information distribution method according to claim 3,
The navigation information distribution method, wherein the communication condition is one of a communication method, a communication speed, and a communication service, or a combination thereof. The navigation information distribution method according to claim 4,
When a communication system with a high communication speed is detected, an instruction to obtain information with a large amount of data is displayed on the menu screen as compared with when a communication system with a low communication speed is detected. Navigation information distribution method. The navigation information distribution method according to claim 4,
When a fixed-rate communication service is detected, an instruction for obtaining information with a large amount of data is displayed on the menu screen as compared with when a metered-rate communication service is detected. Delivery method. An information terminal device used in the navigation information distribution method according to any one of claims 3 to 6,
Means for transmitting and receiving various data to and from the information distribution center;
Detecting means for detecting communication conditions of the transmitting / receiving means;
Display means for displaying the menu screen according to the communication conditions of the transmitting and receiving means detected by the detecting means,
An information terminal device wherein the route guidance information, which is a result of a calculation performed by the information distribution center based on a command selected from the menu screen, is received by the transmission / reception means and displayed on the display means. Arithmetic means for performing at least a route search operation based on an instruction transmitted from the information terminal device according to claim 7,
Processing means for processing the route guidance information, which is the calculation result, to transmit the information in a form according to the communication conditions;
A transmission unit for transmitting the route guidance information after processing to the information terminal device.

Images