PURPOSE: To satisfactorily balance a profit distribution between the game parlor side and the player side by restoring the remainder obtained by subtracting a profit part at a predetermined rate from a sales result obtained at each game machine within a unit period to a player though arbitrary adjustment of a dividing number during the next unit period.

CONSTITUTION: In a game parlor incorporating a plurality of game machines 20, the remainder obtained by subtracting a profit at a predetermined rate given from a sales result obtained through the operation of the game machines, is restored to a player at each game machine. A number of playing media paid out in accordance with an amount designated by the player is used as a rent-out number, and a number of playing medium acquired from a game machine 20 through a game, is used as a premium number, and a rate of the premium number to the rentout number is set as the dividing number at each game machine 20. Then by arbitrarily adjusting thus set dividing number at each game machine 20, the remainder obtained by subtracting a profit at a predetermined rate from a sales result given through the operation of each game machine within a unit period is restored to a player at each game machine during the next unit period.