| 摘要 |
A communication navigation system is provided with a communication center apparatus (3) and a communication terminal apparatus (4, 5), both of which transmit and receive information by two-way communication through a communication network (1, 2). The communication center apparatus is provided with: a processing device (72) 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 (71, 73) 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 (38) 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.
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