In the game device, a period coefficient acquirer 102 extracts a first period coefficient as a factor for determining a communication period from game data. A communication manager 108 manages the status of connection with at least one communication terminal and a period coefficient deriving unit 106 derives a second period coefficient as a factor for determining a communication period from the status of connection. A period determiner 104 determines a communication period for communication with a game controller based on the first period coefficient and the second period coefficient. A correspondence table holder 120 retains a correspondence table of the status of connection and the second period coefficient, and a period coefficient deriving unit 106 refers to the correspondence table and derives the second period coefficient.