To prevent a leakage of information advantageous for the players maintaining an operation timing for the demonstration display or the like on the game machine as done with the power source turned on in the unpredictable state by setting and controlling the operation condition of a number of game machines arranged within the game parlor individually without requiring so much time and labor and costs.

The game machine 1 is provided with a performance display means for carrying out the performance displays to be used in the games, a performance display control means which makes the performance display means conduct the performance displays and a control means which controls the direction of the performance displays to be given to the performance display control means. The control means gives to the performance display control means the direction of the demonstration performance display to be made when no game is done at a random timing.