PROBLEM TO BE SOLVED: To adjust the service to an optimum one by judging whether a benefit is added to a game data medium or not if a desired valuable value selected to be added to the game data medium exceeds a predetermined valuable value, and by adding the benefit to the game data medium only when the judgement result is YES. ;SOLUTION: When a game card 1B as a game data medium is inserted in a device body 1A, whether the game card 1B is valid or not is certified in accordance with data received from the game card 1B. Then, an inserted valuable value M inserted in the device body 1A is recognized ID, and a desired valuable value M selected to be added within the range of the inserted valuable value M is recognized 1E. If the recognized valuable value M is greater than a predetermined valuable value MO, it is judged ID that a benefit should be added, and a desired benefit game is carried out 1G in a game pattern in accordance with the result of the judgement, a benefit is added IH to the game card 1B.;COPYRIGHT: (C)1997,JPO
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