A plurality of players operate player characters using controllers. The player characters form a friend team to attack enemy characters. The player characters make attacks on the enemy characters by firing bullets into a game space using guns, in accordance with the operations of the respective players. If one of the player characters attacks another one of the player characters, a life of the attacked player character decreases, and a life item for restoring a life also appears in the game space. The attacked player character can restore a life by acquiring the life item.