In a game system, each time a player plays a game in a game device (1) by using a card (2), a server device (3) communicating with a plurality of game devices (1) receives play data obtained as a result by the play and a card identifier of the card (2). According to these, the server device (3) generates terminal supply play data indicating the game skill of the player and stores the play data while correlating it to the card identifier, and date data indicating the date. Moreover, the server device (3) sends the date data indicating the date when a first player played during a first period to a mobile terminal (4) of a second player who has specified the first player as a friend, and sends another date data indicating the date when the first player played during a second period and terminal supply play data of the first player corresponding to another date data to the mobile terminal (4).