To allow a player to flexibly select a machine type and enable a smooth game when a game parlor lends game media at a plurality of lending rates.

This game system stores prepaid value data 10e3, reserved ball data 10e2, selectable rate data 10e7 and setting rate data 10e5 in a storage part 10e, sets a rate selected from the selectable rate data 10e7 by the player to the setting rate data 10e5 when a rate selection permission flag 10e4 is "1 (ON)", sets "0 (OFF)" to the rate selection permission flag 10e4, and when a card return button 18 is depressed, sets "1 (ON)" to the rate selection permission flag 10e4.