A game progress program is provided that allows a player to play an interesting secondary game while the main program and associated data are being loaded, without increasing the amount of data to be stored. While the main program and associated data are being loaded into the RAM, the background sound output controller reads the background sound data from the background sound data storage unit and outputs background sounds from the speaker, and the operation sound output controller receives player operations via the first key, second key and fourth key located on the controller, reads out from the operation sound data storage unit the operation sound data associated with each key, and outputs operation sounds from the speaker.