Map depiction device, navigation apparatus, file renewing method, file renewing program, and information recording medium for file renewing program

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 is playing 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.