| 摘要 |
A navigation apparatus includes map data, a map change information receiving unit and a map display change unit. The map data includes predetermined map information having two modes: an unavailable mode in which the map information is unusable, and an available mode in which the map information is usable. The map change information receiving unit receives change information of the predetermined map information, which is distributed by transmission. On receiving the change information, the map display change unit switches the two modes of the predetermined map information.
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