A game device in which a first comparison unit compares an exemplary model posture (posture that is supposed to be adopted by a player) at a reference time and a posture of the player indicated by posture data acquired by a posture data acquiring unit at a compared time. A second comparison unit executes at least one of: a comparison between a different posture from the exemplary model posture at the reference time and the posture of the player indicated by the posture data acquired at the compared time; and a comparison between the exemplary model posture at the reference time and a different posture from the posture of the player indicated by the posture data acquired at the compared time. An output control unit causes an output based on a comparison between results from the first and second comparison units.