Navigation terminal and method of processing data for a navigation system

A navigation terminal loaded in a vehicle is provided with a wireless communication device connectable to a movable communications network and a present position detection device and instructs implementation of a predetermined navigation function. The gateway apparatus connects the movable communications network and the Internet and implements protocol conversion and charging processing. A navigation server acquires positional data of the vehicle from the navigation terminal via the Internet discriminates map data to be a distribution object to the navigation terminal and generates navigation information based on the instructed navigation function to provide it to the navigation terminal A map search server reads map data discriminated as the distribution object from a map data base accumulating map data and distributes them to the navigation terminal via the Internet