PROBLEM TO BE SOLVED: To improve the security by providing an account for registering ball storage and ball lending every telephone number of players so that a player can perform ball storage and ball lending by use of the account through Internet.;SOLUTION: The account 8 is provided in the memory 7 of a center 5 every telephone number of cellular phones 12, so that the number of stored balls can be registered in the account 8. Accordingly, the number of lent balls can be withdrawn from the number of stored balls in the account 8 to perform a game.;COPYRIGHT: (C)2002,JPO
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