JP2011075403A - Navigation system, navigation apparatus, navigation server, and navigation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation system, a navigation apparatus, a navigation server, and a navigation method, which acquire route search results based on the most recent or detailed network data from a server, and perform navigation continuously, for example, even when a state out of the range of communication and a communication state deteriorate abruptly. <P>SOLUTION: When it is determined that a communication state is normal, route search conditions are transmitted and route search results based on the most recent or detailed network data are received from the server. Contrarily, when it is determined that the communication state is not normal, route search results based on the network data stored in a storage section at a terminal are calculated, and the received route search results or the calculated route search results are outputted to an output section. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a navigation system, a navigation device, a navigation server, and a navigation method.

  Conventionally, a technique has been disclosed in which a route search is not performed on the terminal side, a route search is performed on the server side in response to a request from the terminal side, and a search result is transmitted to the terminal.

  For example, in Patent Document 1, route search conditions are transmitted to a server, route data including guide points created by the server is received, map data is requested from the server, map data is received, and displayed. There has been disclosed a portable terminal that creates a route image based on a range that can be displayed on a screen and route data, and creates a route guidance map image by combining the map image and the route image.

  Also, in Patent Document 2, each of the server and the client terminal uses the information in each database to obtain a route from the departure place to the destination, and the client terminal matches the obtained route. A route guidance system that uses the information in the database on the client terminal side for the matching part, and obtains detailed information about the route obtained by the server for the mismatching part and performs route guidance. It is disclosed.

JP 2005-134209 A JP 2003-014483 A

  However, the conventional technology for searching for a route on the server side has a problem that the route search result on the server side cannot be acquired when the state is out of communication range or when the communication state deteriorates rapidly. .

  For example, the portable terminal described in Patent Document 1 is configured to receive all route data and map data from the server. There was a problem that data could not be acquired.

  Moreover, in the route guidance system described in Patent Document 2, the route search is performed on each of the server side and the client terminal side, and only the difference is received by the client terminal. There is a problem that it becomes impossible to obtain the route search result.

  The present invention has been made in view of the above problems, and can obtain a route search result based on the latest or detailed network data from a server, while the state outside the communication range or the communication state deteriorates rapidly. The purpose is to provide a navigation system, a navigation device, a navigation server, and a navigation method capable of continuing navigation.

  In order to achieve such an object, the navigation system of the present invention can communicate with a navigation server including at least a storage unit and a control unit, and a navigation device including at least a storage unit, an output unit, and a control unit. A navigation system connected to the navigation device, wherein the storage unit of the navigation device includes network data storage means for storing network data defining a traffic network, and the storage unit of the navigation server is the latest or the network data Server-side network data storage means for storing server-side network data that is more detailed network data, and the control unit of the navigation device includes a communication state determination means for determining a communication state with the navigation server, The above communication status Route search condition transmission means for transmitting a route search condition including at least a starting point and a destination to the navigation server when the communication state is determined to be normal by the means, and a route search result transmitted from the navigation server When the communication state determination unit determines that the communication state is not normal, the route search condition receiving unit receives the route search result based on the network data stored in the network storage unit. A route search unit for calculating a route search result to be satisfied, and the route search result received by the route search result receiving unit or the route search result calculated by the route search unit is output to the output unit. Route guidance means for performing route guidance, and the control of the navigation server Based on the route search condition receiving means for receiving the route search condition transmitted from the navigation device and the server side network data stored in the server side network data storage means, by the route search condition receiving means. Server-side route search means for calculating the route search result satisfying the received route search condition; route search result transmission means for transmitting the route search result calculated by the server-side route search means to the navigation device; , Provided.

  In the navigation system according to the present invention, in the navigation system described above, the route search condition transmitting unit determines the route search when the communication state determination unit determines that the communication state has been restored to a normal state. Transmitting the conditions to the navigation server, the route guidance means performing the route guidance by replacing the route search result newly acquired by the route search result acquisition means and causing the output unit to output the route search result; It is characterized by.

  The navigation system according to the present invention is characterized in that, in the navigation system described above, the communication state determination means monitors the communication state with the navigation server and makes the determination based on the communication state. .

  The navigation system according to the present invention is characterized in that, in the navigation system described above, the communication state is a communication strength level, a communication speed, a communication line type, and / or a communication range or a state outside the communication range. And

  Further, the navigation device of the present invention is a navigation device including at least a storage unit, an output unit, and a control unit, which are communicably connected to a navigation server including at least a storage unit. A network data storage unit that stores network data that defines a traffic network, and the storage unit of the navigation server stores server-side network data that is the latest or more detailed network data than the network data. Server-side network data storage means, and the control unit determines at least communication state determination means for determining a communication state with the navigation server, and the communication state determination means determines that the communication state is normal. Route search conditions including origin and destination A route search condition transmitting means for transmitting the route search condition to the navigation server, and a route search result that satisfies the route search condition calculated based on the server side network data stored in the server side network data storage means. Based on the network data stored in the network storage means when the communication status determination means determines that the communication status is not normal by the route search result receiving means received from the server and the communication status determination means, A route search unit that calculates a route search result that satisfies the condition, and the route search result received by the route search result reception unit or the route search result calculated by the route search unit is output to the output unit. A route guidance means for performing route guidance. To.

  The navigation server of the present invention is a navigation server including at least a storage unit and a control unit, which is communicably connected to a navigation device including at least a storage unit and an output unit. The storage unit includes network data storage means for storing network data defining a traffic network, and the storage unit of the navigation server stores server-side network data that is the latest or more detailed network data than the network data. A server side network data storage means, and the control unit receives a route search condition including at least a starting point and a destination, which is transmitted from the navigation device when the communication state is determined to be normal. Condition receiving means and the server side network Server-side route searching means for calculating the route search condition received by the route search condition receiving means based on the server-side network data stored in the data storage means, and the server-side route The route search result calculated by the search means is transmitted to the navigation device, and the route search result based on the route search result or the network data stored in the network data storage means is output to the output unit. And a route search result transmission means for controlling such a manner.

  Further, the navigation method of the present invention is executed in a navigation system in which a navigation server having at least a storage unit and a control unit and a navigation device having at least a storage unit, an output unit, and a control unit are connected to be communicable. And the storage unit of the navigation device includes network data storage means for storing network data defining a traffic network, and the storage unit of the navigation server is the latest or more than the network data. Server-side network data storage means for storing server-side network data, which is also detailed network data, and is executed in the control unit of the navigation device to determine a communication state with the navigation server. And a route search condition including at least a starting point and a destination when the communication state is determined to be normal in the communication state determination step executed in the control unit of the navigation device. A route search condition transmission step for transmitting to the route server, a route search condition reception step for receiving the route search condition transmitted from the navigation device, executed by the control unit of the navigation server, and the control unit of the navigation server The server that calculates the route search condition that satisfies the route search condition received in the route search condition reception step based on the server-side network data stored in the server-side network data storage means Side route search step and the above navigation A route search result transmission step for transmitting the route search result calculated in the server side route search step to the navigation device, which is executed in the control unit of the navigation server, and in the control unit of the navigation device. In the route search result receiving step for receiving the route search result transmitted from the navigation server, and the communication state determining step executed in the control unit of the navigation device, it is determined that the communication state is not normal. A route search step for calculating a route search result that satisfies the route search condition based on the network data stored in the network storage means, and executed in the control unit of the navigation device, Received at the route search result reception step A route guidance step of performing route guidance by causing the output unit to output the route search result or the route search result calculated in the route search step.

  The navigation method of the present invention is a navigation method that is executed in a navigation device that includes at least a storage unit, an output unit, and a control unit, and is connected to a navigation server that includes at least a storage unit. The storage unit of the navigation device includes network data storage means for storing network data defining a traffic network, and the storage unit of the navigation server is a latest or more detailed network data than the network data. Server-side network data storage means for storing side network data, and a communication state determination step for determining a communication state with the navigation server, executed in the control unit, and the communication state in the communication state determination step Is considered normal A route search condition transmitting step for transmitting a route search condition including at least a starting point and a destination to the navigation server, and the server-side network data stored in the server-side network data storage means. When the calculated route search condition satisfying the route search condition is received from the navigation server, the route search result receiving step and the communication state determining step determine that the communication state is not normal. Based on the network data stored in the storage means, a route search step for calculating a route search result that satisfies the route search condition, and the route search result received in the route search result receiving step, or the route The above route search result calculated in the search step By outputting to the output unit, characterized in that it comprises a route guidance step of performing route guidance, the.

  The navigation method of the present invention is a navigation method executed in a navigation server having at least a storage unit and a control unit, which is communicably connected to a navigation device having at least a storage unit and an output unit. The storage unit of the navigation device includes network data storage means for storing network data defining a traffic network, and the storage unit of the navigation server is the latest or more detailed network data than the network data. Server-side network data storage means for storing server-side network data, which is executed in the control unit, and is transmitted from the navigation device when the communication state is determined to be normal, and at least a starting point and a destination Receive route search conditions including The route search condition receiving step, and the server side network data stored in the server side network data storage means, the route search result received in the route search condition reception step The server side route search step to be calculated and the route search result calculated in the server side route search step are transmitted to the navigation device, and the route search result or the network data stored in the network data storage means A route search result transmission step for controlling the route search result based on the output to be output to the output unit.

  According to this invention, the navigation device stores the network data defining the traffic network in the storage unit, and the navigation server is the latest or more detailed network data than the network data stored in the navigation device. The server side network data is stored in the storage unit, and the navigation device determines a communication state with the navigation server. When the communication state is determined to be normal, the navigation server sets a route search condition including at least a departure place and a destination. When the route search result transmitted from the navigation server is received and it is determined that the communication state is not normal, the route search result satisfying the route search condition is obtained based on the network data stored in the storage unit. Calculated and received route search result or calculated route search The navigation server performs route guidance by outputting the result to the output unit, the navigation server receives the route search condition transmitted from the navigation device, and receives the route based on the server-side network data stored in the storage unit A route search result that satisfies the search condition can be calculated, and the calculated route search result can be transmitted to the navigation device. As a result, the present invention can obtain a route search result based on the latest or detailed network data from the server, while continuing navigation even when the state outside the communication range or the communication state deteriorates rapidly. There is an effect that can be performed. In particular, the present invention is based on the latest or detailed network data even when applied to a navigation device that does not have a large capacity storage or memory on the local (navigation device) side and stores only network data with a small amount of data. When the communication state is not sufficient to download the route search result, the route search result is obtained based on the network data stored on the local (navigation device) side, and the navigation can be continuously performed. In addition, for example, when there is a reroute such as off-route, when a scheduled road is closed due to an accident, or when there is a significant traffic jam and the desired arrival time is not met, an alternative route can be provided. Even when it becomes necessary, it is possible to obtain a new route search result related to the alternative route according to the communication state at the point and to continue navigation.

  Further, according to the present invention, when the navigation device determines that the communication state has been restored to the normal state, the navigation device transmits the route search condition to the navigation server and replaces the newly acquired route search result with the output unit. The route guidance can be performed by outputting to. Thereby, even when the communication state is restored from the normal state to the normal state, the present invention obtains a new server side route search result and continuously provides route guidance without giving the user a sense of incongruity. There is an effect that it can be executed.

  Further, according to the present invention, the navigation device can monitor a communication state with the navigation server and make a determination based on the communication state. Thereby, this invention produces the effect that the transition of a communication state is grasped | ascertained and the suitable route search result by the side of a server or a terminal can be acquired according to the present communication state.

  Further, according to the present invention, the communication state can be a communication strength level, a communication speed, a communication line type, and / or a communication range or a state outside the communication range. Thus, according to the present invention, the communication state downloads the route search result according to the communication strength, the communication speed, the type of the communication line, the communication state such as the communication range / out of communication range, etc. Even if it is insufficient, there is an effect that the route guidance can be continuously performed on the terminal side without giving the user a sense of incongruity.

  In the above description, the navigation system of the present invention has been described as an example. However, the navigation apparatus, the navigation server, and the navigation method have the same effect.

FIG. 1 is a block diagram showing an example of the configuration of the navigation system in the present embodiment. FIG. 2 is a flowchart showing an example of basic processing of the navigation system in the present embodiment. FIG. 3 is a diagram illustrating an example of a route search result replacement output process in the navigation system of the present embodiment.

  DESCRIPTION OF EMBODIMENTS Embodiments of a navigation system, a navigation device, a navigation server, a navigation method, and a program according to the present invention will be described below in detail with reference to FIGS. Note that the present invention is not limited to the embodiments.

[Navigation system configuration]
First, an example of the configuration of the navigation system in the present embodiment will be described below with reference to FIG. Here, FIG. 1 is a block diagram showing an example of the configuration of the navigation system in the present embodiment, and conceptually shows only the portion related to the present invention in the configuration.

  As shown in FIG. 1, the navigation system of this embodiment schematically includes a navigation server 200 including at least a control unit 202 and a storage unit 206, and an output unit 114, a control unit 102, and a storage unit 106. At least the navigation device 100 provided is configured to be communicable. The communication is, for example, remote communication such as wired / wireless communication via the network 300, and has a function of mutually connecting the navigation device 100 and an external device such as the navigation server 200. For example, the Internet, telephone It may be a line network (including a mobile terminal line network and a general telephone line network), an intranet, power line communication (PLC), or the like. Each unit of the navigation device 100 and the navigation server 200 is communicably connected via an arbitrary communication path.

[Configuration of Navigation Server 200]
Here, in FIG. 1, the navigation server 200 receives the route search condition transmitted from the navigation device 100 and, based on the server-side network data stored in the storage unit 206, the received route search condition. It has a function of calculating a search result and transmitting the calculated route search result to the navigation device 100. The navigation server 200 is connected to the navigation apparatus 100 through the communication control interface unit 204 via the network 300 so as to be communicable with each other, and includes a control unit 202 and a storage unit 206. The control unit 202 is a control unit that performs various processes, and performs route search and the like. The communication control interface unit 204 is an interface connected to a communication device (not shown) such as an antenna or a router connected to a communication line, a telephone line, etc., and performs communication control between the navigation server 200 and the network 300. It has a function to perform. That is, the communication control interface unit 204 has a function of communicating data with the navigation device 100 or the like via a communication line. The storage unit 206 is a storage unit such as a fixed disk device, and stores various databases and tables (server-side network database 206a etc. to map database 206c).

  Among these components of the storage unit 206, the server-side network database 206a is a server-side network data storage that stores server-side network data that is the latest or more detailed than the network data stored in advance in the navigation device 100. Means. Here, the network data is network data that defines a traffic network. As an example, the server-side network data stored in the server-side network database 206a is data related to roads, passages, routes, and the like configured by nodes and links. For example, the road network data is a road network representation such as an intersection. It is composed of a combination of node data relating to the node that is the upper node and link data relating to the link that is the road section between the nodes. More specifically, the node data may include a node number, position coordinates such as latitude and longitude, a node type, the number of links to be connected, a connection node number, an intersection name, and the like. The link data includes link number, type of road to be connected, route number of national road, prefectural road, city road, etc., important route information, attribute information of administrative area where link exists, link length, road service status, abnormal Traffic restrictions such as traffic restrictions, vehicle weight restrictions, vehicle height restrictions, width, road width classification, number of lanes, speed limit, in-link attributes such as overpasses, tunnels and bridges, and names etc. Good.

  Here, in the server-side network data stored in the server-side network database 206a, evaluation information is associated with node numbers, link numbers, etc. in order to evaluate each route composed of nodes and links. It may be stored. As an example, the evaluation information includes traffic regulation data, transportation timetable data, and usage fee data. Here, the traffic regulation data is data that defines various traffic regulations. For example, traffic regulation data such as roads that are damaged or road construction, traffic zones, and community zones that are installed to ensure traffic safety. This includes information such as the prohibition of entry of vehicles and the prohibition of entry of ordinary vehicles due to being connected to private land. The timetable data is, for example, information representing timetables of various transportation facilities such as trains, airplanes, buses, streetcars, ropeways, monorails, cable cars, and ships. In addition, usage fee data is consumed when using transportation such as trains, airplanes, buses, streetcars, ropeways, monorails, cable cars, ships, etc., or when traveling by car, motorcycle, etc. This information is used to calculate the transportation cost. You may memorize | store the positional information, such as latitude longitude information, etc. of the facilities etc. which exist on the map used for route preparation at the time of moving by a car, a motorcycle, a bicycle, walking, etc. These various server-side network data are stored in advance in the server-side network database 206a, and the control unit 202 of the navigation server 200 periodically downloads the latest network data via the network 300 to the server-side network data. The server side network data stored in the network database 206a may be updated.

  The guidance database 206b is guidance data storage means for storing guidance data (voice guidance data, display guidance data, etc.) to be output according to the current position on the guidance route. For example, the guidance database 206b may correspond to “turn to the left at the next intersection” associated with the direction of travel at a branch point or the like on the guidance route or “route” associated with the current position deviating from the guidance route. Voice guidance data such as “I missed it” may be stored, and this voice guidance data is used when the control unit 102 of the navigation device 100 executes voice guidance as described later. In addition, the guidance database 206b stores display guidance data such as turn-by-turn (TBT) associated with the traveling direction at a branch point on the guidance route and guidance indicating that the current position is off the guidance route. The display guidance data may be used when the control unit 102 of the navigation device 100 executes the display guidance as will be described later. Here, the TBT is an arrow navigation that displays guidance such as a right or left turn on the screen.

  The map database 206c is map data storage means for storing map data such as map drawing data and spot data for drawing a map. As an example, the map drawing data stored in the map database 206c is drawing data for drawing buildings, roads, terrain such as mountains and rivers, and the like. For example, the drawing data may be data representing one area, site, area, or the like on a map with polygonal polygons, or data for two-dimensional display or three-dimensional display. Further, the drawing data may be outdoor map data such as road maps of the whole country and each region, and indoor map data such as a floor guide map relating to a building having height information (for example, a multilevel parking lot). There may be. Further, the spot data stored in the map database 206c is data in which information is associated with a certain point. For example, in association with latitude / longitude, facility information such as stores, notes (characters such as place names) ), Icons (additional icons such as advertisements, general icons, etc.), symbols (map symbols, etc.) and the like are stored. The various map data stored in the map database 206c may be configured in mesh units (for example, first to third regional division mesh data, 100m mesh data, etc.) partitioned by longitude and latitude. . These map data are stored in advance in the map database 206c, and the control unit 202 of the navigation server 200 periodically downloads the latest data via the network 300 and stores it in the map database 206c. Data may be updated. The map data stored in the map database 206c may be raster format map data or vector format map data.

  The control unit 202 has an internal memory for storing a control program such as an OS (Operating System), a program that defines various processing procedures, and necessary data. And the control part 202 performs the information processing for performing various processes with these programs. The control unit 202 includes a route search condition receiving unit 202a, a server side route search unit 202b, and a route search result transmission unit 202c in terms of functional concept.

  Among these, the route search condition receiving unit 202a is route search condition receiving means for receiving a route search condition transmitted from the navigation device 100.

  The server side route search unit 202b calculates a route search result that satisfies the route search condition received by the route search condition reception unit 202a based on the server side network data stored in the server side network database 206a. It is a route search means. For example, the server-side route search unit 202b uses the server-side network data stored in the server-side network database 206a for the guide route from the departure point to the destination that satisfies the route search condition including at least the departure point and the destination. To generate a route search result related to the guidance route. At that time, the server-side route search unit 202b may perform an evaluation on the required time, a fee, a distance, and the like for each guide route based on the evaluation information stored in the server-side network database 206a. The route search result may be calculated by selecting / sorting guide routes. Further, the server side route search unit 202b may acquire the guide data related to the calculated guide route from the guide database 206b and include it in the route search result, and acquire map data related to the map including the calculated guide route from the map database 206c. And may be included in the route search result.

  The route search result transmission unit 202c is a route search result transmission unit that transmits the route search result calculated by the server side route search unit 202b to the navigation device 100.

[Configuration of Navigation Device 100]
In FIG. 1, the navigation device 100 determines a communication state with the navigation server 200, and transmits a route search condition including at least a departure place and a destination to the navigation server 200 when the communication state is determined to be normal. The route search result is received from the navigation server 200, and when it is determined that the communication state is not normal, the route search result is calculated based on the terminal side network data stored in the terminal side network database 106a. It has a function of executing route guidance by causing the output unit 114 to output the received route search result or the calculated route search result. In the present embodiment, the navigation device 100 is connected to the navigation server 200 via the communication control interface unit 104 via the network 300 so as to be able to communicate with each other. The control unit 202, the storage unit 206, and the output unit 114. And an input unit 116. Here, the navigation apparatus 100 may include a position acquisition unit 112 having a GPS function, an IMES function, and the like so that current position information can be acquired in real time.

  The navigation device 100 is, for example, an in-vehicle car navigation device that performs car navigation, an information processing device such as a desktop or notebook personal computer that is generally commercially available, a mobile navigation device such as a mobile phone, PHS, or PDA. It may be. As an in-vehicle navigation device 100 that performs car navigation, for example, it can be supplied with electric power from a vehicle, and is detachably fixed to a vehicle body such as a dashboard by an attachment, etc. It is also possible to acquire a signal (for example, vehicle speed pulse, fuel consumption, etc.) from the vehicle without having, and have a built-in communication module, and can communicate with the navigation server 200 or the like via the network 300 within the communication range, The device is also capable of downloading data such as search results from the navigation server 200.

  Of the configuration of the navigation device 100, the position acquisition unit 112 may be, for example, a position acquisition unit that receives a position information signal transmitted from the position transmission device 500. For example, the position acquisition unit 112 has a GPS function, an IMES function, and the like so that current position information can be acquired in real time. Here, the position transmitting device 500 may be a GPS device that transmits a position information signal (GPS signal) related to orbit data, time information, and the like, and uses a position information signal having characteristics similar to those of the GPS signal. An IMES device that realizes an IMES (Indoor Message System) technology that enables indoor positioning may be used. The IMES technology is a system developed from the framework of the quasi-zenith satellite, which is a positioning satellite system. Further, the position transmission device 500 may be a GPS repeater that transmits a GPS signal received outdoors indoors. Further, the position transmission device 500 may be a small transmission device that is arbitrarily installed at various locations on each floor in a building (for example, a multilevel parking lot). In addition, self-position information (position ID etc.) according to an installation place is allocated to this small transmitter. When the navigation device 100 enters the communicable range, the navigation device 100 receives the self-position information transmitted from the small transmitter as a position information signal. The communication method at this time may be, for example, various short-range wireless methods such as an RFID (Radio Frequency Identification) tag system and Bluetooth (registered trademark), an infrared communication method, and the like. Further, the position transmission device 500 may be a wireless LAN access point. In the present embodiment, the control unit 102 calculates position information including latitude, longitude, and height information from the position information signal acquired by the position acquisition unit 112. Further, the position acquisition unit 112 may receive the wireless LAN signal and acquire the identification information of the access point. In the present embodiment, the control unit 102 may acquire the position information by specifying the position of the access point from the identification information unique to the access point acquired by the position acquisition unit 112.

  In addition, the position acquisition unit 112, for example, based on the direction information such as the traveling direction of the navigation device 100 detected by the direction sensor, the distance information detected by the distance sensor, and the map data, the user of the navigation device 100 You may acquire the positional information which shows a present position. Here, a geomagnetic sensor that detects the absolute traveling direction of the navigation device 100 and an optical gyro that detects the relative traveling direction of the navigation device 100 may be used as the direction sensor. In addition, the direction sensor may be an electronic compass that can acquire information on the direction and inclination by combining a geomagnetic sensor and an acceleration sensor. Further, when the navigation device 100 is an in-vehicle information processing terminal, the distance sensor may generate a pulse corresponding to the rotation of the vehicle and detect the travel distance based on the number of rotations of the wheels. Further, when the navigation device 100 is an in-vehicle information processing terminal, the position acquisition unit 112 may acquire position information indicating the own vehicle position from inter-vehicle communication of a communication device mounted on each vehicle.

  The output unit 114 is an output unit for outputting a route search result received from the navigation server 200, a route search result calculated based on the terminal-side network database 106a, and the like. Here, the output unit 114 may be display means for displaying a display screen for displaying a route search result or the like (for example, a display or a monitor composed of a liquid crystal, an organic EL, or the like). Voice output means (for example, a speaker or the like) that outputs voice guidance data or the like based on a route search result or the like as voice may be used. The input unit 116 may be input means (for example, a key input unit, a touch panel, a keyboard, a microphone, etc.) for inputting a departure point, a current position, a destination, and the like. The input / output control interface unit 108 controls the position acquisition unit 112, the output unit 114, the input unit 116, and the like.

  The communication control interface unit 104 is an interface connected to a communication device (not shown) such as an antenna or a router connected to a communication line, a telephone line, etc., and communicates between the navigation device 100 and the network 300. It has a function to perform control. That is, the communication control interface unit 104 has a function of communicating data with the navigation server 200 or the like via a communication line.

  The storage unit 106 is a storage unit such as a fixed disk device, and stores various files, tables, and databases (terminal-side network database 106a, route search result file 106b, etc.).

  Among these, the terminal side network database 106a is a terminal side network data storage means for storing terminal side network data. The terminal-side network data stored in the terminal-side network database 106a is network data that is simplified or not updated as the latest than the server-side network data stored in the server-side network database 206a. For example, the terminal-side network data may be network data obtained by omitting some data items from the server-side network data and extracting only main data items. In this case, the terminal-side network data is stored in the terminal-side network database 106a. The terminal-side network data is relatively smaller in data size than the server-side network data stored in the server-side network database 206a. Further, the terminal-side network data may be network data stored in advance in the storage unit 106 without being updated by downloading from the navigation server 200 or the like. In other words, the terminal-side network data is network data having a property of being rougher or older than the server-side network data.

  The route search result file 106b is route search result storage means for storing the route search result received by the route search result receiving unit 102d or the route search result calculated by the route search unit 102e.

  In addition, the storage unit 106 may store guidance data, map data, and the like. As an example, the guide data and map data stored in the storage unit 106 of the navigation device 100 are simplified or more simplified than the guide data and map data stored in the guide database 206b and the map database 206c of the navigation server 200, or Data that is not updated as the latest data may be used.

  The control unit 102 includes an internal memory for storing a control program such as an OS, a program defining various processing procedures, and necessary data. And the control part 102 performs the information processing for performing various processes by these programs. The control unit 102 includes a current position information acquisition unit 102a, a communication state determination unit 102b, a route search condition transmission unit 102c, a route search result reception unit 102d, a route search unit 102e, and a route guidance unit 102f in terms of functional concept. Is done.

  Among these, the current position information acquisition unit 102a is current position information acquisition means for acquiring current position information related to the current position of the user of the navigation device 100. Here, the current position information acquisition unit 102 a is the navigation apparatus detected by the position information calculated from the position information signal received from the position transmission device 500 by the position acquisition unit 112 and / or the direction sensor of the position acquisition unit 112. The current position information of the user of the navigation device 100 including direction information such as the traveling direction of 100 may be acquired. Further, the current position information acquisition unit 102a may acquire, as current position information, position coordinates and the like regarding the current position input by the user via the input unit 116. Here, the current position input by the user via the input unit 116 may be a position where the user actually exists, and a virtual current position arbitrarily selected by the user (for example, Tokyo It may be an arbitrary point such as a station or an airport in Osaka selected by a user in the area. Specifically, on the map data display screen displayed on the output unit 114, coordinates specified by the user (for example, a designation operation on the touch panel type output unit 114) via the input unit 116, and Alternatively, the direction information may be acquired as the current position information.

  The communication state determination unit 102b is a communication state determination unit that determines a communication state with the navigation server 200. For example, the communication state determination unit 102b monitors the communication state with the navigation server 200 and makes a determination based on the communication state. The communication state monitored by the communication state determination unit 102b includes the strength of communication strength, the communication speed, the type of communication line, the state within / out of communication range, and the like. For example, when the communication state determination unit 102b is in a communication state sufficient to receive the route search result transmitted from the navigation server 200 (for example, the communication strength is strong, the communication speed is fast, the communication line is thick, the communication The communication state is determined to be normal. On the other hand, when the communication state is insufficient to receive the route search result transmitted from the navigation server 200 (for example, the communication strength is weak, the communication speed is slow, the communication line is thin, In the case of being out of communication range), it is determined that the communication state is not normal. For this determination, a threshold value may be set in advance in association with each communication state.

  The route search condition transmission unit 102c is a route search condition transmission unit that transmits a route search condition to the navigation server 200 when the communication state determination unit 102b determines that the communication state is normal. Here, the route search condition is information including at least a departure place and a destination. Here, the route search condition transmission unit 102c may acquire the route search condition by transmitting the departure point and the destination to the user via the input unit 116, and may transmit the route search condition to the navigation server 200. Further, the route search condition transmission unit 102c may set the current position information acquired by the current position information acquisition unit 102a as the starting point of the route search condition. Further, the route search condition transmission unit 102 c may transmit the route search condition stored in advance in the storage unit 106 to the navigation server 200.

  The route search result receiving unit 102d is a route search result receiving unit that receives the route search result transmitted from the navigation server 200 and stores it in the route search result file 106b.

  In addition, the route search unit 102e, when the communication state determination unit 102b determines that the communication state is not normal, the route satisfying the route search condition based on the terminal-side network data stored in the terminal-side network database 106a. It is a route search means for calculating a search result and storing the calculated route search result in the route search result file 106b (terminal side). For example, the route search unit 102e searches for the guide route from the departure point to the destination that satisfies the route search condition including at least the departure point and the destination using the terminal side network data stored in the terminal side network database 106a. Then, a route search result related to the guidance route is generated. At that time, the route search unit 102e may perform an evaluation on the required time, a fee, a distance, and the like for each guide route based on the evaluation information stored in the terminal-side network database 106a. Route search results may be calculated by selecting / sorting routes. In addition, when map data, guidance data, and the like are stored in the storage unit 106, the route search unit 102e acquires map data related to the map including the calculated guide route from the storage unit 106 and includes it in the route search result. Alternatively, the guidance data regarding the calculated guidance route may be acquired from the storage unit 106 and included in the route search result.

  The route guidance unit 102f is a route search result received by the route search result receiving unit 102d and stored in the route search result file 106b (hereinafter referred to as “server side route search result”), or a route search unit 102e. This is route guidance means for performing route guidance by causing the output unit 114 to output the route search result (hereinafter referred to as “terminal-side route search result”) obtained by the above and stored in the route search result file 106b. Here, the route guide unit 102f may sequentially output the route search result according to the update of the current position information acquired by the current position information acquisition unit 102a. For example, the current position based on the current position information is the guide route. When approaching the upper branch point, the output unit 114 may output voice guidance data, display guidance data, or the like for direction indication. When the server side route search result is stored in the route search result file 106b, the route guide unit 102f causes the server side route search result to be output to the output unit 114, while the route search result file 106b stores the terminal in the terminal. When the side route search result is stored, the terminal side route search result may be output to the output unit 114. When both the server side route search result and the terminal side route search result are stored in the route search result file 106b, the route guide unit 102f preferentially outputs the server side route search result to the output unit 114. May be. Further, the route guidance unit 102f receives the terminal side route search result calculated by the route search unit 102e when the communication state is not normal, when the communication state is restored to the normal state by the route search result reception unit 102d. Instead of the server side route search result, the output unit may output the result. As an example, when the current position is in the middle of the guide route based on the terminal-side route search result, the route guide unit 102f starts the route from the closest point on the guide route based on the newly acquired server-side route search result. The route guidance is continuously executed by starting the guidance.

  Above, description of an example of a structure of the navigation system in this embodiment is finished.

[Navigation system processing]
Next, an example of processing of the navigation system according to the present embodiment configured as described above will be described in detail below with reference to FIGS.

[Basic processing]
First, an example of the basic processing of the navigation system in the present embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing an example of basic processing of the navigation system in the present embodiment.

  As shown in FIG. 2, first, the communication state determination unit 102b of the navigation device 100 monitors the communication state with the navigation server 200 to determine whether or not the communication state is normal (step SA-1). . For example, when the communication state determination unit 102b is in a communication state sufficient to receive the route search result transmitted from the navigation server 200 (for example, the communication strength is strong, the communication speed is fast, the communication line is thick, the communication If the communication state is insufficient to receive the route search result transmitted from the navigation server 200 (for example, the communication strength is low). If the communication state is weak, the communication speed is slow, the communication line is thin, or the communication area is out of service area, etc., it is determined that the communication state is not normal. In order to determine whether or not the communication state is normal, a threshold value may be set in advance in association with the communication state, and the communication state determination unit 102b may perform determination based on the threshold value.

  Then, the route search condition transmission unit 102c of the navigation device 100, when the communication state determination unit 102b determines that the communication state is normal (step SA-1, Yes), the route search condition including at least the departure place and the destination. Is transmitted to the navigation server 200 (step SA-2). Here, the route search condition transmission unit 102c acquires the route search condition by controlling the user to input the departure place and the destination via the input unit 116, and transmits the route search condition to the navigation server 200. May be. Further, the route search condition transmission unit 102c may set the current position information acquired by the current position information acquisition unit 102a as the starting point of the route search condition. The current position information acquisition unit 102a may acquire current position information from a position information signal transmitted from the position transmission device 500, and the input unit 116 on the map data display screen displayed on the output unit 114. The coordinates specified by the user (for example, the specifying operation using the touch panel type output unit 114) and the azimuth information may be acquired as the current position information.

  Then, the route search condition receiving unit 202a of the navigation server 200 receives the route search condition from the navigation device 100 (step SA-3).

  Then, the server-side route search unit 202b of the navigation server 200 performs a server-side route search that satisfies the route search condition received by the route search condition receiving unit 202a based on the server-side network data stored in the server-side network database 206a. The result is calculated (step SA-4). For example, the server-side route search unit 202b uses the server-side network data stored in the server-side network database 206a for the guide route from the departure point to the destination that satisfies the route search condition including at least the departure point and the destination. To generate a server side route search result related to the guide route. Here, the server-side route search unit 202b may acquire the guide data related to the calculated guide route from the guide database 206b and include it in the server-side route search result, and map data related to the map including the calculated guide route may be included in the map database. 206c may be included in the server side route search result.

  Then, the route search result transmission unit 202c of the navigation server 200 transmits the server side route search result acquired by the server side route search unit 202b to the navigation device 100 (step SA-5).

  Then, the route search result receiving unit 102d of the navigation device 100 receives the server-side route search result transmitted from the navigation server 200 and stores it in the route search result file 106b (step SA-6).

  As described above, the navigation device 100 acquires the server-side route search result from the navigation server 200 when the communication state determination unit 102b determines that the communication state is normal. On the other hand, in step SA-1 described above, If the communication state determination unit 102b determines that the communication state is not normal (No at Step SA-1), the route search unit 102e of the navigation device 100 stores the terminal-side network stored in the terminal-side network database 106a. Based on the data, a terminal-side route search result that satisfies the above-described route search condition is calculated, and the calculated terminal-side route search result is stored in the route search result file 106b (step SA-7). For example, the route search unit 102e searches for the guide route from the departure point to the destination that satisfies the route search condition including at least the departure point and the destination using the terminal side network data stored in the terminal side network database 106a. Then, a terminal side route search result related to the guidance route is generated.

  Then, the route guidance unit 102f of the navigation device 100 causes the output unit 114 to output the server side route search result or the terminal side route search result stored in the route search result file 106b (step SA-8). That is, the route guidance unit 102f causes the output unit 114 to output the server side route search result stored in the route search result file 106b when the communication state is normal, while the route search result when the communication state is not normal. The terminal side route search result stored in the file 106b is output to the output unit 114. Here, the route guide unit 102f may sequentially output the route search result according to the update of the current position information acquired by the current position information acquisition unit 102a. For example, the current position based on the current position information is the guide route. When approaching an upper branch point or the like, the output unit 114 may output voice guidance data, display guidance data, or the like for direction instruction included in the route search result. In addition, for example, when there is a reroute such as off-route, when a scheduled road is closed due to an accident, or when there is a significant traffic jam and the desired arrival time is not met, an alternative route can be provided. When necessary, the navigation device 100 returns the processing to step SA-1 to cause the output unit 114 to output a new route search result regarding the alternative route acquired according to the communication state at the point. Also good. The above is an example of the basic processing of the navigation system in the present embodiment.

[Replacement output processing]
Next, the replacement output process of the route search result in the navigation system of the present embodiment will be described below with reference to FIG. This route search result replacement output process assumes that the terminal side route search result is not sent to the server side route so as not to give the user a sense of incongruity, assuming that the communication state such as out of communication range is restored from a normal state to a normal state. One of the purposes is to output the search result. Here, FIG. 3 is a diagram illustrating an example of a route search result replacement output process in the navigation system of the present embodiment.

  As shown in FIG. 3, first, the communication state determination unit 102b of the navigation device 100 monitors the communication state with the navigation server 200 to determine whether or not the communication state is normal (step SB-1). .

  Then, when the communication state determining unit 102b determines that the communication state is normal (step SB-1, Yes), the route search condition transmitting unit 102c of the navigation device 100 at least starts as in step SA-2 described above. By transmitting the route search condition including the place and the destination to the navigation server 200, the processing after step SA-2 is executed, and in this case, the subsequent route search result replacement output processing is not necessary.

  On the other hand, when the communication state determination unit 102b determines that the communication state is not normal (No at Step SB-1), the route search unit 102e of the navigation device 100 stores the terminal-side network stored in the terminal-side network database 106a. Based on the data, the terminal side route search result satisfying the route search condition including at least the departure point and the destination described above is calculated, and the calculated terminal side route search result is stored in the route search result file 106b (step SB-2). ).

  Then, the route guidance unit 102f of the navigation device 100 causes the output unit 114 to output the terminal side route search result acquired by the route search unit 102e and stored in the route search result file 106b (step SB-3). Note that the output processing of the terminal side route search result by the route guidance unit 102f is continuously performed until the following step SB-10, and sequentially according to the update of the current location information acquired by the current location information acquisition unit 102a, and the like. May be executed.

  Then, the communication state determination unit 102b of the navigation device 100 determines whether or not the communication state has been restored to a normal state (step SB-4).

  If the communication state determination unit 102b determines that the communication state has not recovered to a normal state (step SB-4, No), the communication state determination unit 102b continues to monitor the communication state until the communication state is recovered.

  On the other hand, when the communication state determination unit 102b determines that the communication state has been restored to the normal state (step SB-4, Yes), the route search condition transmission unit 102c of the navigation device 100 at least determines the departure place and the purpose. The route search condition including the ground is transmitted to the navigation server 200 (step SB-5). Here, the route search condition transmitting unit 102c, when the current location information acquired by the current location information acquisition unit 102a is updated and the departure point of the route search condition in step SB-2 is changed, etc. The current position based on the current position information may be reset as a departure place and transmitted to the navigation server 200.

  Then, the route search condition receiving unit 202a of the navigation server 200 receives the route search condition from the navigation device 100 (step SB-6).

  Then, the server-side route search unit 202b of the navigation server 200 performs a server-side route search that satisfies the route search condition received by the route search condition receiving unit 202a based on the server-side network data stored in the server-side network database 206a. The result is calculated (step SB-7).

  Then, the route search result transmission unit 202c of the navigation server 200 transmits the server side route search result calculated by the server side route search unit 202b to the navigation device 100 (step SB-8).

  Then, the route search result receiving unit 102d of the navigation device 100 receives the server side route search result transmitted from the navigation server 200 and stores it in the route search result file 106b (step SB-9).

  Then, the route guidance unit 102f of the navigation device 100 replaces the terminal side route search result during the route guidance with the server side route search result newly stored in the route search result file 106b and causes the output unit 114 to output the result. Thus, the route guidance is continuously executed (step SB-10). That is, as an example, the route guidance unit 102f performs the current position acquired by the current position information acquisition unit 102a on the guide route based on the newly acquired server side route search result during the route guidance based on the terminal side route search result. The route guidance is continuously executed by starting the route guidance from the point where the current position of the information is closest. In addition to this example, when the server side route search result received by the route search result receiving unit 102d is stored in the route search result file 106b, the terminal side route search result is overwritten and stored, thereby providing route guidance. The replacement output process of the route search result by the unit 102f may be executed.

  The above is an example of the route search result replacement output process in the navigation system of the present embodiment. As a result, even when the communication state is restored from the normal state to the normal state, the server side route search result can be newly acquired and the route guidance can be continuously executed without giving the user a sense of incongruity. it can.

  Above, description of the process of the navigation system in this embodiment is finished.

[Other embodiments]
Although the embodiments of the present invention have been described so far, the present invention can be implemented in various different embodiments within the scope of the technical idea described in the claims other than the above-described embodiments. It may be done.

  In addition, among the processes described in the embodiment, all or part of the processes described as being automatically performed can be performed manually, or the processes described as being performed manually can be performed. All or a part can be automatically performed by a known method.

  In addition, processing procedures, control procedures, specific names, information including parameters such as registration data and facility search conditions, screen examples, and database configurations shown in the above documents and drawings may be specially noted. It can be arbitrarily changed except for.

  Further, regarding the navigation device 100 and the navigation server 200, each illustrated component is functionally conceptual and does not necessarily need to be physically configured as illustrated.

  For example, the processing functions provided in each device of the navigation device 100 and the navigation server 200, in particular, the processing functions performed by the control unit 102 and the control unit 202 are all or any part of the processing functions. (Central Processing Unit) and a program interpreted and executed by the CPU, or can be realized as hardware by wired logic. The program is recorded on a recording medium to be described later, and is mechanically read by the navigation device 100 and the navigation server 200 as necessary. That is, the storage unit 206 such as a ROM or HD stores a computer program for performing various processes by giving instructions to the CPU in cooperation with the OS. This computer program is executed by being loaded into the RAM, and constitutes a control unit in cooperation with the CPU.

  The computer program may be stored in the navigation apparatus 100 and an application program server connected to the navigation server 200 via an arbitrary network 300, and all or part of the computer program is stored as necessary. It can also be downloaded.

  The program according to the present invention can also be stored in a computer-readable recording medium. Here, the “recording medium” is an arbitrary “portable physical medium” such as a flexible disk, a magneto-optical disk, a ROM, an EPROM, an EEPROM, a CD-ROM, an MO, a DVD, a Blu-ray Disc, or the like. It includes a “communication medium” that holds a program in a short period of time, such as a communication line or a carrier wave when a program is transmitted via a network represented by a LAN, WAN, or the Internet.

  The “program” is a data processing method described in an arbitrary language or description method, and may be in any format such as source code or binary code. Note that the “program” is not necessarily limited to a single configuration, and functions are achieved in cooperation with a separate configuration such as a plurality of modules and libraries or a separate program represented by the OS. Including things. Note that a well-known configuration and procedure can be used for a specific configuration for reading a recording medium, a reading procedure, an installation procedure after reading, and the like in each device described in the embodiment.

  Various databases and the like (server-side network database 206a to map database 206c, terminal-side network database 106a, route search result file 106b, etc.) stored in the storage unit 106 and the storage unit 206 are RAM, a memory device such as a ROM, a hard disk These are storage means such as fixed disk devices, flexible disks, optical disks, etc., and store various programs, tables, databases, web page files, etc. used for various processing and website provision.

  Further, the navigation device 100 and the navigation server 200 connect information processing apparatuses such as known personal computers and workstations, and software (including programs, data, etc.) that allows the information processing apparatus to implement the method of the present invention. It may be realized by mounting.

  Furthermore, the specific form of distribution / integration of the devices is not limited to that shown in the figure, and all or a part of them may be functional or physical in arbitrary units according to various additions or according to functional loads. Can be distributed and integrated.

  As described above in detail, according to the present invention, the route search result based on the latest or detailed network data can be acquired from the server, while the out-of-communication state or the communication state deteriorates rapidly. Since it is possible to provide a navigation system, a navigation device, a navigation server, and a navigation method capable of continuing navigation, it is extremely useful in various fields such as information equipment and information processing fields that support navigation. Useful.

100 Navigation device 102 Control unit
102a Current position information acquisition unit
102b Communication state determination unit
102c Route search condition transmitter
102d Route search result receiver
102e route search unit
102f Route guidance unit 104 Communication control interface unit 106 Storage unit
106a Terminal side network database
106b route search result file 108 input / output control interface unit 112 position acquisition unit 114 output unit 116 input unit 200 navigation server 202 control unit
202a Route search condition receiver
202b server side route search part
202c Route search result transmission unit 204 Communication control interface unit 206 Storage unit
206a Server side network database
206b Information database
206c Map database 300 Network 500 Location transmitter

Claims (9)

A navigation system in which a navigation server including at least a storage unit and a control unit, and a navigation device including at least a storage unit, an output unit, and a control unit are communicably connected,
The storage unit of the navigation device includes:
Network data storage means for storing network data defining a transportation network;
With
The storage unit of the navigation server includes:
Server-side network data storage means for storing server-side network data which is the latest or more detailed network data than the network data;
With
The control unit of the navigation device includes:
Communication state determination means for determining a communication state with the navigation server;
Route search condition transmission means for transmitting a route search condition including at least a departure place and a destination to the navigation server when the communication state is determined to be normal by the communication state determination means;
Route search result receiving means for receiving a route search result transmitted from the navigation server;
Route search means for calculating a route search result satisfying the route search condition based on the network data stored in the network storage means when the communication state determination means determines that the communication state is not normal. When,
Route guidance means for performing route guidance by causing the output unit to output the route search result received by the route search result receiving means or the route search result calculated by the route search means;
With
The control unit of the navigation server is
Route search condition receiving means for receiving the route search condition transmitted from the navigation device;
Based on the server side network data stored in the server side network data storage means, server side route search means for calculating the route search result that satisfies the route search condition received by the route search condition reception means;
Route search result transmission means for transmitting the route search result calculated by the server side route search means to the navigation device;
A navigation system characterized by comprising: The navigation system according to claim 1,
The route search condition transmission means includes:
When the communication state determination means determines that the communication state has been restored to a normal state, the route search condition is transmitted to the navigation server,
The route guidance means
Replacing the route search result newly acquired by the route search result acquisition means and performing the route guidance by causing the output unit to output the route search result;
Features a navigation system. The navigation system according to claim 1 or 2,
The communication state determination means includes
A navigation system, wherein the communication state with the navigation server is monitored and the determination is made based on the communication state. The navigation system according to any one of claims 1 to 3,
The navigation system according to claim 1, wherein the communication state is a communication strength level, a communication speed, a communication line type, and / or a communication range or a state outside the communication range. A navigation device including at least a storage unit, an output unit, and a control unit, connected to a navigation server including at least a storage unit so as to be communicable,
The storage unit of the navigation device includes:
Network data storage means for storing network data defining a transportation network;
With
The storage unit of the navigation server includes:
Server-side network data storage means for storing server-side network data which is the latest or more detailed network data than the network data;
With
The control unit
Communication state determination means for determining a communication state with the navigation server;
Route search condition transmission means for transmitting a route search condition including at least a departure place and a destination to the navigation server when the communication state is determined to be normal by the communication state determination means;
A route search result receiving means for receiving, from the navigation server, a route search result calculated based on the server side network data stored in the server side network data storage means and satisfying the route search condition;
Route search means for calculating a route search result satisfying the route search condition based on the network data stored in the network storage means when the communication state determination means determines that the communication state is not normal. When,
Route guidance means for performing route guidance by causing the output unit to output the route search result received by the route search result receiving means or the route search result calculated by the route search means;
A navigation device comprising: A navigation server including at least a storage unit and a control unit, which is communicably connected to a navigation device including at least a storage unit and an output unit,
The storage unit of the navigation device includes:
Network data storage means for storing network data defining a transportation network;
With
The storage unit of the navigation server includes:
Server-side network data storage means for storing server-side network data which is the latest or more detailed network data than the network data;
With
The control unit
Route search condition receiving means for receiving a route search condition including at least a departure place and a destination, which is transmitted from the navigation device when the communication state is determined to be normal;
Based on the server side network data stored in the server side network data storage means, server side route search means for calculating the route search result that satisfies the route search condition received by the route search condition reception means;
The route search result calculated by the server side route search means is transmitted to the navigation device, and the route search result based on the route search result or the network data stored in the network data storage means is the output unit. Route search result transmission means for controlling to be output to
A navigation server comprising: A navigation method executed in a navigation system in which a navigation server including at least a storage unit and a control unit, and a navigation device including at least a storage unit, an output unit, and a control unit are communicably connected,
The storage unit of the navigation device includes:
Network data storage means for storing network data defining a transportation network;
With
The storage unit of the navigation server includes:
Server-side network data storage means for storing server-side network data which is the latest or more detailed network data than the network data;
With
Executed in the control unit of the navigation device;
A communication state determination step for determining a communication state with the navigation server;
Executed in the control unit of the navigation device;
A route search condition transmission step for transmitting a route search condition including at least a departure place and a destination to the navigation server when the communication state is determined to be normal in the communication state determination step;
Executed in the control unit of the navigation server,
A route search condition receiving step for receiving the route search condition transmitted from the navigation device;
Executed in the control unit of the navigation server,
A server side route search step for calculating the route search condition satisfying the route search condition received in the route search condition reception step based on the server side network data stored in the server side network data storage means; ,
Executed in the control unit of the navigation server,
A route search result transmission step of transmitting the route search result calculated in the server side route search step to the navigation device;
Executed in the control unit of the navigation device;
A route search result receiving step for receiving a route search result transmitted from the navigation server;
Executed in the control unit of the navigation device;
A route search that calculates a route search result that satisfies the route search condition based on the network data stored in the network storage means when it is determined in the communication state determination step that the communication state is not normal Steps,
Executed in the control unit of the navigation device;
A route guidance step for performing route guidance by causing the output unit to output the route search result received in the route search result receiving step or the route search result calculated in the route search step; ,
A navigation method comprising: A navigation method executed in a navigation device including at least a storage unit, an output unit, and a control unit, connected to a navigation server including at least a storage unit in a communicable manner,
The storage unit of the navigation device includes:
Network data storage means for storing network data defining a transportation network;
With
The storage unit of the navigation server includes:
Server-side network data storage means for storing server-side network data which is the latest or more detailed network data than the network data;
With
Executed in the control unit,
A communication state determination step for determining a communication state with the navigation server;
A route search condition transmission step for transmitting a route search condition including at least a departure place and a destination to the navigation server when the communication state is determined to be normal in the communication state determination step;
A route search result receiving step for receiving, from the navigation server, a route search result calculated based on the server side network data stored in the server side network data storage means, and satisfying the route search condition;
A route search step for calculating a route search result that satisfies the route search condition based on the network data stored in the network storage means when the communication state is determined to be not normal by the communication state determination step. When,
A route guidance step for performing route guidance by causing the output unit to output the route search result received in the route search result receiving step or the route search result calculated in the route search step; ,
A navigation method comprising: A navigation method that is communicatively connected to a navigation device that includes at least a storage unit and an output unit, and that is executed in a navigation server that includes at least a storage unit and a control unit,
The storage unit of the navigation device includes:
Network data storage means for storing network data defining a transportation network;
With
The storage unit of the navigation server includes:
Server-side network data storage means for storing server-side network data which is the latest or more detailed network data than the network data;
With
Executed in the control unit,
A route search condition receiving step for receiving a route search condition including at least a departure place and a destination, which is transmitted from the navigation device when the communication state is determined to be normal;
A server side route search step for calculating the route search condition satisfying the route search condition received in the route search condition reception step based on the server side network data stored in the server side network data storage means; ,
The route search result calculated in the server side route search step is transmitted to the navigation device, and the route search result based on the route search result or the network data stored in the network data storage means is output as the output. Route search result transmission step for controlling to be output to the unit,
A navigation method comprising:

Images