PROBLEM TO BE SOLVED: To investigate selection behavior of a user using a card ID which the user owns.;SOLUTION: A method which investigates user's selection behavior for a plurality of game machines 4B allocated in a prescribed site ST using a game system in which play data 26 of a user is stored on a server device 3 in association with a card ID which is unique for each card 9 the user owns, the server device 3 acquires the card ID from the game machines 4B and specifies the corresponding play data 26 and the specified play data 26 is provided to a game machine 4 performs the steps of: installing a card reader 50 in each of the game machines 4B in the site ST; recording a card ID which the card reader 50 acquires in association with a code unique for each of the game machines 4B; determining whether or not the play data 26 corresponding to the card ID recorded at the site ST is stored in the server device 3 at a later day; and giving a prescribed award AW to the play data 26 of the user, if the play data 26 exists.;COPYRIGHT: (C)2013,JPO&INPIT
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