PURPOSE: To prevent a hall computer from becoming larger due to the concentration of loads to be controlled, and improve the game property of game equipment by a method wherein a computer is built in a game medium leasing machine, and the leasing control of a game medium for the game medium leasing machine and the game control of a game machine are broken up for the processings.

CONSTITUTION: A game medium leasing machine 40 for game equipment 5 is connected to a hall computer 20 which controls a prize exchange device 10 by which a game medium can be exchanged with a prize, and is provided for each game machine 30. In this case, a computer 41 is built in the game medium leasing machine 40. Also, the computer 41 is connected to the game machine 30 by a control bus 42 and data bus 43, and at the same time, the computer 41 is connected to the hall computer 20 by a data bus 43. In addition, the computer 41 respectively performs the leasing control of the game medium and the game control of the game machine 30 by the control bus 42. Then, the result of the lease control is transferred to the hall computer 20 and prize exchange device 10 by the data bus 43, and also, the result of the game control is transferred to the hall computer 20.