Patent ID: 7693658

Claim:
A navigation apparatus, comprising: a road data-obtaining unit that obtains road data containing coordinate information of an intersection and used to display a roadmap; an intersection arrangement data-obtaining unit that obtains intersection arrangement data that is independent from the road data, adopts a data structure that enables an update thereof to be executed independently of the road data, and is used to display an intersection arrangement at an intersection in a display mode different from a display mode adopted for displaying the roadmap; and a display control unit that displays at a display unit the roadmap by using the road data obtained by the road data-obtaining unit and displays an intersection arrangement at an intersection on the roadmap by using the intersection arrangement data obtained by the intersection arrangement data-obtaining unit, wherein: the intersection arrangement data include intersection coordinate data containing coordinate information corresponding to an intersection as well as display data used to display an intersection arrangement at an intersection; when approaching a specific intersection on the roadmap, the display control unit makes a decision as to whether or not the intersection coordinate data of the intersection arrangement data include coordinate information corresponding to coordinate information for the specific intersection on the roadmap; and if the intersection coordinate data are determined to include the coordinate information corresponding to the coordinate information for the specific intersection on the roadmap, the display control unit judges that the road data and the intersection arrangement data match up, and displays the intersection arrangement at the specific intersection by using the intersection arrangement data.