To provide a system and a method for developing effective sound, with which an effective sound corresponding to an image displayed on the variable display device of a game machine can be developed at low cost in a short time.

When developing effective sound corresponding to the image displayed on the variable display device of a PACHINKO machine, a user collects 'character' and 'direction contents' on a home page accessible through the Internet in S101 and 'character' and 'direction contents' to be adopted are determined out of collected works in S105. Afterwards, operation is moved to S107 and 'image display program' and 'display image data' are collected in the home page. In S111, 'image display program' and 'display image data' to be adopted are determined out of collected works. Afterwards, operation is moved to S113 and 'effective sound data' are collected on the home page. In S117, 'effective sound data' to be adopted are determined out of collected works. Afterwards, operation is moved to S119 and farther moved to the manufacturing stage of PACHINKO machine.