Navigation terminal and method of processing data for a navigation system

A navigation information providing server for providing information including map data to a navigation terminal via a network, the navigation information providing server comprising:

• a generating device for generating navigation information based on navigation function instructed by the navigation terminal via the network;
• a providing device for providing the generated navigation information to the navigation terminal;
• an acquiring device for acquiring positional data corresponding to a present position of a movable body from the navigation terminal via the network;
• a discriminating device for discriminating map data of a predetermined area of a point and the vicinity of it corresponding to the acquired positional data as a distribution object;
• a map memory device for accumulating map data;
• a reading device for reading the map data discriminated as the distribution object from the map memory device;
• and
• a distributing device for distributing the read map data to the navigation terminal via the network.

A navigation information providing server for providing information including map data to a navigation terminal having a nonvolatile memory device for storing the map data acquired from the navigation information providing server via a network, the navigation information providing server comprising:

• a generating device for generating navigation information based on navigation function instructed by the navigation terminal via the network;
• a providing device for providing the generated navigation information to the navigation terminal;
• an acquiring device for acquiring positional data corresponding to a present position of a movable body from the navigation terminal via the network;
• a discriminating device for discriminating map data of a predetermined area of a point and the vicinity of it corresponding to the acquired positional data as a distribution object;
• a map memory device for accumulating map data;
• a reading device for reading the map data discriminated as the distribution object from the map memory device;
• a distributing device for distributing the read map data to the navigation terminal via the network;
• and
• a table memory device for storing a management table including information about the map data distributed to the navigation terminal,
• wherein the discriminating device discriminates map data except the distributed map data as the distribution object with reference to the management table stored in the table memory table device.

A navigation server for providing navigation information to a navigation terminal via a network with which a map search server having a map memory device for accumulating map data is connected, the navigation server comprising:

• a generating device for generating navigation information based on navigation function instructed by the navigation terminal via the network;
• a providing device for providing the generated navigation information to the navigation terminal;
• an acquiring device for acquiring positional data corresponding to a present position of a movable body from the navigation terminal via the network;
• and
• a discriminating device for discriminating map data of a predetermined area of a point and the vicinity of it corresponding to the acquired positional data as a distribution object by the map search server.

A navigation server for providing navigation information to a navigation terminal having a nonvolatile memory device in which the map data acquired from a map search server via a network, the navigation server comprising:

• a generating device for generating navigation information based on navigation function instructed by the navigation terminal via the network;
• a providing device for providing the generated navigation information to the navigation terminal;
• an acquiring device for acquiring positional data corresponding to a present position of a movable body from the navigation terminal via the network;
• a discriminating device for discriminating map data of a predetermined area of a point and the vicinity of it corresponding to the acquired positional data as a distribution object by the map search server;
• and
• a table memory device for storing a management table including information about the map data distributed to the navigation terminal,
• wherein the discriminating device discriminates map data except the distributed map data as the distribution object with reference to the management table stored in the table memory device.