A movable terminal stores previously a travel time schedule in a regular travel state of a public transportation. The movable terminal executes a route retrieval from candidates containing route sections traveled by using the public transportation and route sections traveled by using different transportation (i.e., foot, vehicle) other than the public transportation. As a result of the route retrieval, when it is determined that the route using the public transportation is more suitable, a request for a multi-modal retrieval based on actual present travel state of the public transportation is transmitted to a center. A center route received thereafter from the center is recorded as a guidance route used for executing route guidance.