To provide a winning prize exchanging system, allowing exchange of winning balls for optional goods desired by a player.

An information storage medium 182 is provided with a function as a financial card associated with a predetermined account. In the information storage medium 182 carried by the player or in association with it, the number of winning balls as a counting result of game media gained by the player is registered to be available as money for the account. In this process, according to game conditions for achievement of acquisition of the game media, a predetermined number of points equivalent to the winning balls is given to the player, and the number of points is also registered in addition to the number of the winning balls.