MAP DRAWING DEVICE, NAVIGATION DEVICE, FILE UPDATING METHOD, FILE UPDATING PROGRAM, AND INFORMATION RECORDING MEDIUM ON WHICH THE FILE UPDATING PROGRAM IS RECORDED

摘要

Reducing a time when a navigation apparatus cannot be used by an update operation of data for displaying map to thereby avoid vexatious complication of update process. A navigation apparatus 100 reads out data for update from DVD in use of a DVD drive 106 to update data recorded in an HD for displaying map. In such the update, the navigation apparatus 100 precedently updates data corresponding to a map in the vicinity of a present position of vehicle, and simultaneously updates rest of the data in use of a vacant time of process.