To make it possible to facilitate set work deposit limit items of saved game medium, to grasp a deposit upper limit money amount through the setting of the deposit limit items, and to prepare a proper settlement prepare money.

After inputting a sum upper limit money amount, a ball exchanging rate, and a token exchanging rate into corresponding columns N11, N12, N13 respectively using an upper limit set screen 550A, the depositable money amount at the present time is calculated according to the sum upper limit money amount, the respective exchanging rates, and the ball saving count and the token saving number at the present time and displayed in the corresponding column S13 when ball (token) saving requirement is present, then the savable ball count (the savable token count) is calculated and displayed in the corresponding column S14 (S15) by dividing the depositable money amount by the ball (token) money exchanging rate according to the ball saving requirement (the token storing requirement), further the control regulating the ball saving (the token saving) processing is done in the case that a savable ball count (a savable token count) exceeds the ball storing possible number (the token storing possible number).