Communication navigation system and method, program storage device and computer data signal embodied in carrier wave

Abstract

A communication navigation system is provided with a communication center apparatus ( ) and a communication terminal apparatus ( ), both of which transmit and receive information by two-way communication through a communication network ( ). The communication center apparatus is provided with: a processing device ( ) for generating request correspondence information including route information indicating a planned route corresponding to request information and generating, if at least one portion of the planned route is present out of a service area of the communication navigation system, announcement information for announcing this fact; and a center side communication device ( ) for receiving the request information and transmitting the request correspondence information and the announcement information through the communication network. The communication terminal apparatus is provided with: a terminal side communication device ( ) for transmitting the request information and receiving at least the announcement information through the communication network; and an input device for inputting the request information and giving an opportunity of inputting the request information in response to the reception of the announcement information.