In a traffic support system, journey information creating means is incorporated in an information processing device formed as a work station. On the basis of information concerning the journey of an airplane and accumulated as a database, and information recorded in a data recording device and obtained each time the airplane travels, the journey information creating means creates new information for the next journey of the airplane. This created information is recorded in the data recording device and brought into the airplane. Accordingly, information obtained while a mobile body travels can be used in subsequent journeys of the mobile body, thereby further enhancing the convenience of the system.