PURPOSE: To easily recognize the result of a game by starting the game only when it is judged that the game can be performed from the data of the number of rental balls or that of the number of holding balls recorded on a card loaded on a card processing machine by a control part, and computing the new number of holding balls and displaying by updating it on a display part.

CONSTITUTION: The card processing machine 30 is arranged at the lower part of each game machine 20 in a game shop where the game machines 20 are installed connectively as making an island, while, a card rental machine 40 is installed between neighboring game machines 20. The card processing machine 30 is comprised by providing a display part for the number of holding balls and a card input/output groove, etc., on the surface of it, and the card rental machine 40 by providing a note throw-in port and a coin throw-in port, etc. When it is decided that the card is an appropriate one for use in the game when it is inserted to the card processing machine 30 by a control part 50, it is judged whether or not the game can be started based on the presence/absence of the number of holding balls by a judging part 53, and the number of holding balls is displayed on the display part 39 by performing computation (the number of rental balls+the number of prize balls-the number of consumption of balls=the number of holding balls) by an arithmetic part 52.