A vehicle allocation information output apparatus relates to a vehicle capable of supplying electric power to an electric power supply destination, and outputs vehicle allocation information being information relating to the vehicle to be allocated to the electric power supply destination, the apparatus retrieving a route from a current location of the vehicle to the electric power supply destination, calculating a suppliable electric power amount of the vehicle on arrival at the electric power supply destination for the route being retrieved, and outputting information relating to a vehicle allocation pattern in which a consumption electric power amount is minimized as the vehicle allocation information, the vehicle allocation pattern being a vehicle allocation pattern in which a total amount of the suppliable electric power amount of the vehicle to be allocated is equal to or greater than a required electric power amount being required at the electric power supply destination.