A current value guide unit of a game device shows a user a current value of one game parameter indicating a current state of an operation subject. An action control unit causes the operation subject to perform an action in response to an operation performed by the user. A game parameter changing unit causes the one game parameter to change in a case where the operation subject moves, a case where the operation subject attacks an enemy, and a case where the operation subject receives damage due to an attack from the enemy. A determination unit determines whether or not the current value of the one game parameter is within a predetermined range. An inhibition unit inhibits the operation subject from performing an action when it is determined that the current value of the one game parameter is within the predetermined range.