NAVIGATION DEVICE, MAP SERVER, MAP UPDATING SYSTEM, MAP UPDATING METHOD, AND MAP UPDATING PROGRAM

摘要

There has been a problem that when an update object area is wide, the amount of data to be updated is too much by the map update processing of a conventional navigation device, and the communication time is too long. According to the invention, an update file is selected from server files corresponding to the type of road in each section of navigation map data. Thus, since a server file classified by type of road and corresponding to the type of road updated in each section is selected as an update file, the amount of data to be updated is reduced, and the communication time is shortened.