There is provided a game device capable of provoking a competing mood between players in a music game. In order to show each of a first and a second player the timing when a game operation is to be performed, reference arrow marks (46, 48) and a special timing guide arrow mark (61) gradually approaching the reference arrow marks (46, 48) are displayed. According to an evaluation result of game operation by the actual players, the display position of the special timing guide arrow mark (61) is gradually moved toward the display position of the reference arrow marks (46, 48) relating to the battle partner so as to impose a new game operation timing to a competing opponent.