| 摘要 |
In a navigation-related processing, when it is necessary to access a navigation data area 121 in a hard disk device, an access data amount determining portion 211 determines whether the navigation-related processing includes access by a predetermined amount or more of data. When the determination result is affirmative, an access restriction instructing portion 212 sends a hard disk access restricting instruction to a disk recording processing portion 221. In a state where the access of the disk recording processing portion 221 to an additional-function data area 122 of the hard disk is restricted, a navigation processing section 210 accesses the navigation data area 121. As a result, even when a navigation-related processing and a specific additional function-related process other than a navigation function are concurrently performed, it is possible to provide navigation information well.
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