To provide a game device and an information memory medium capable of outputting a game sound of a high tone quality to a player and a person watching game play of the player.

A game sound outputted by oneself is synchronized with a game sound outputted by the other game device on the basis of sound synchronizing data received from the other game device. Output of the game sound is restarted with a pause 20 as the stating point when the other game device outputs a game sound in the vicinity of the pause 20 of a bar and oneself outputs a game sound in no vicinity of the pause. Output of a game sound of a game device of oneself is started with the pause 20 as the starting point when the other game device outputs a game sound in the vicinity of the pause 20 and oneself does not output a game sound (in midway participation). The sound synchronizing data contains a bar number (section specifying data) and time T2 up to a pause 20 of the next bar.