Patent ID: 6584402
Filing Date: 2003-06-24
Classification: G01C,G08G

Abstract:
A communication navigation system comprising a communication center apparatus and a communication terminal apparatus, both of which transmit and receive information by two-way communication through a communication network,(i) the communication center apparatus comprising: 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 that the at least one portion of the planned route is present out of the service area; 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, (ii) the communication terminal apparatus comprising: 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.