To provide a game data management device allowing a player to obtain game situation related to two or more different games and a group game.

This game data management device 1 is provided with a game data totaling means 11 for totaling game data of a plurality of game machines 2, a related game machine detection means 12 for detecting at least one or more other game machines 2 using a supply source of a game medium in common concerning each game machine 2, and a related game condition determining means 13 for determining that the game machine 2 allowing the related game machine detection means 12 to detect the other game machine 2 and the other game machine 2 are in the related game condition. The game data totaling means 11 is constituted so as to total game data by distinguishing between the related game data being game data of the game machine 2 under the related game condition and the other game data.

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