A vehicle allocation system oversees the operation of a plurality of auto-piloted vehicles, used to transport passengers between major ports such as airports, train stations, shopping malls, etc. The vehicle allocation system establishes a search time interval and predicts passenger demands and the status of the monitored vehicles within the search time interval. A predetermined number of vehicles are assigned to each of the ports in an area. Each port includes a parking lot or queue to accommodate waiting vehicles and a terminal which notifies a host computer of the number of currently available vehicles, passenger demands for vehicles, vehicle destination information, arrival information and so forth. The host computer has a memory storing predicted demand data based upon past demand history. The host computer calculates any excess or deficiency of vehicles in the ports on the basis of the predicted demand data and the information obtained from the terminals within the search time interval. On the basis of the result of such calculation, vehicles are reallocated from ports having an excess of vehicles to ports lacking sufficient vehicles.