Map Update Server, Map Update System, and Car Navigation System

摘要

An update information providing server for providing data of an updated portion in map data composed of plural kinds of the data includes: a map data storage unit configured to store incremental update data of a difference between the data at a predefined time and newest data, and a data size of the incremental update data; an update request receiving unit configured to receive from a user terminal a map data update request including a capacity of a recording medium, and priority information for specifying a data kind of the data to be preferentially updated; an update order information making unit configured to make update order information; an update information transmission unit configured to extract the incremental update data from the storage unit, to make update information including the extracted incremental update data and the update order information, and to transmit the made update information to the user terminal.