A game machine for development is connected to a host computer, reads out a file requested by a game program under development from a storage device, and executes the game program. In the game machine for development, a file confirmation section confirms whether or not the file requested by the game program is stored in the storage device, a file request section requests the host computer to transmit the file in a case where the file is not stored, and a storage processor acquires the file from the host computer and stores the file in the storage device.