| 摘要 |
PROBLEM TO BE SOLVED: To enable a user to operate after a start-up process without keeping the user waiting by greatly shortening the start-up process necessary for displaying the present position at a start time or the like. SOLUTION: The automobile navigation system 1 displays the present position and guides routes to support running of a vehicle with the use of map data recorded in a CD-ROM 2. In the start-up process of turning off a power source with the same CD-ROM 2 kept loaded and turning on the power source again, the present position displayed last is displayed with the use of data held in an SDRAM 5 backed up by a battery and the user's operation to an input unit 13 is accepted with priority. Even when the same CD-ROM 2 is taken out once and inserted again or when a music CD is inserted again after being reproduced, the start-up process can be shortened with the use of the backed up data. |
