| 摘要 |
A communication navigation system is provided with a communication navigation terminal (5) and a communication center apparatus (3) with a communication network (2) for connecting them. The communication navigation terminal is provided with a route navigation device (20, 40, 50). If a movable body is on a route searched by the communication center apparatus, it performs a route navigation on the basis of a current position measured by a measurement apparatus (10, 18) and route information received from the communication center apparatus. If the movable body deviates from the searched route, it performs a simple navigation, in case that the current position is out of a service area of the communication navigation system, where it is not possible to transmit and receive the information through the communication network.
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