| 摘要 |
In a navigation device (Unv), a processor 1 reads from a storage 4 directional object data (Ddr) onto a working area 3. The directional object data (Ddr) has a message plane and a plain plane, thereby representing a directional object whose planes are facing in each different direction. Based on the positional relationship between the user's current position and the directional object, the processor 1 determines which to render the message plane or the plain plane of the directional object. In the case of the message plane, the processor 1 renders it opaque. On the other hand, the processor 1 renders the plain plane transparent or translucent. In this manner, the resulting display image data generated by the navigation device (Unv) can represent maps meeting the user's demands and needs.
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