Abstract: When a request to execute the same Java application program as a Java (registered trademark, omitted hereafter) application program currently being executed, the Java application program is deployed into a work area of a RAM 4 and the plurality of Java applications are executed simultaneously. A process result of the Java application program executed according to operation information is displayed on one of display units 8-1 and 8-2 which corresponds to an operation unit via which the operation information is inputted.

Abstract: A navigation system includes: a map data storage device that stores map data including a not-yet-checked area having roads not yet checked for navigability; a path search processing block that searches a path to a destination based on the map data stored in the map data storage device; a map display block that does not make roads in the not-yet-checked area objects to be displayed when the path searched by the path search processing block does not pass the not-yet-checked area, and that makes only roads constructing the path of the roads in the not-yet-checked area objects to be displayed when the path passes the not-yet-checked area; and a screen display device that displays the roads, which are made the objects to be displayed by the map display block based on the map data in the map data storage device.

Abstract: A map area indicated by map data is partitioned into a plurality of map units respectively having a squared area, and a route from a current position of a vehicle to a destination is determined according to the map data read from a map recording medium mounted on a disk unit. The route is partitioned into a plurality of route links respectively included in one map unit. In cases where each route link is placed in a general road section, a first route link map unit including the route link and eight map units adjacent to the first route link map unit are specified. Also, in cases where each route link is placed in a throughway section, only a second route link map unit including the route link is specified. Map data of each first route link map unit, map data of the eight map units adjacent to the first route link map units and map data of the second route link map units are stored in a data buffer in a pre-reading process, and a navigation function is performed according to the map data of the data buffer.

Abstract: When map data necessary for route guiding is pre-read from a map recording medium 101, and accumulated in a data buffer, the quantity or the ratio of the pre-read data with respect to data required for the entire distance is notified by an image or a voice to a user. Thus, the user can know a progress in the pre-reading operation of the map data.

Abstract: A map area indicated by map data is partitioned into a plurality of map units respectively having a squared area, and a route from a current position of a vehicle to a destination is determined according to the map data read from a map recording medium mounted on a disk unit. The route is partitioned into a plurality of route links respectively included in one map unit. In cases where each route link is placed in a general road section, a first route link map unit including the route link and eight map units adjacent to the first route link map unit are specified. Also, in cases where each route link is placed in a throughway section, only a second route link map unit including the route link is specified. Map data of each first route link map unit, map data of the eight map units adjacent to the first route link map units and map data of the second route link map units are stored in a data buffer in a pre-reading process, and a navigation function is performed according to the map data of the data buffer.

Abstract: A navigation device includes a map information storage means for storing map information such as nodes, links and the like, a present position detection means for detecting a present position of a moving body, a route searching means for searching a route from a present position to a guide point based on the map information, a voice guide message generation means for generating a voice guide message corresponding to the searched route, and a voice output means for outputting the voice guide message. The navigation device is adapted to store a level of importance of nodes and links as a part of said map information, and the voice guide message generation means selects links and nodes on the searched route based on the level of importance and generates a voice guide message corresponding to the selected nodes and links.

Abstract: A navigation device includes a map information storage means for storing map information such as nodes, links and the like, a present position detection means for detecting a present position of a moving body, a route searching means for searching a route from a present position to a guide point based on the map information, a voice guide message generation means for generating a voice guide message corresponding to the searched route, and a voice output means for outputting the voice guide message. The navigation device is adapted to store a level of importance of nodes and links as a part of said map information, and the voice guide message generation means selects links and nodes on the searched route based on the level of importance and generates a voice guide message corresponding to the selected nodes and links.

Abstract: A navigation apparatus capable of outputting the guide information concerning a necessary point input by a driver in response to a request of the driver previously stores map information, specifies an automobile position on the map information by detecting signals such as GPS signals, gyroscopic signals and speed pulse signals, etc., retrieves a point to be guided from the map information on the basis of the present position of the automobile, produces the guide information concerning the point to be guided by processing the map information, and displays the guide information concerning the point to be guided. Further, a guide switch (a touch panel key) as a display mark, a distance to a target destination point and an azimuth toward the target destination point, and a running direction to go at or near the target destination point are also displayed.