Communication navigation system, communication navigation method, route guidance information transmitting device, and terminal unit

摘要

A communication navigation system includes a server SV that transmits route guidance information to terminal units T via the Internet IN, and a transmitter/receiver 15, provided in each terminal unit T, for transmitting specification data that specifies a type of necessary route guidance information, to the server SV via the Internet IN. The server SV transmits only the route guidance information of the type specified by the specification data, to the terminal unit T.