| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure capable of heightening the speed of a navigation function. SOLUTION: This navigation device 100 reads out the first map data M1 recorded in a DVD media 122 or the second map data M2 stored in a removal HDD 124, displays the data on a screen, and guides a user who is a driver to a prescribed destination. In this case, the navigation device 100 reads out the first map data M1 recorded in the DVD media 122 which is basically standard equipment, and, when mounting of the removal HDD 124 which is optional equipment is confirmed, reads out the second map data M2 in the removal HDD 124. Since the removal HDD 124 has more excellent access performance than the DVD media 122, the navigation function can be executed more quickly. COPYRIGHT: (C)2006,JPO&NCIPI |
