Provided is a remote weapon device including a firing arm configured to fire a bullet at a target in response to a firing signal; a driver coupled to the firing arm and configured to move the firing arm to aim the firing arm at the target; a detector configured to detect shaking of the firing arm with respect to a zero position, the zero position corresponding to a position at which the firing arm points at the target and fires the bullet at the target; and a controller configured to obtain a shaking pattern based on the detected shaking and configured to generate the firing signal controlling a firing time when the firing arm fires the bullet according to the shaking pattern to control the firing arm to fire the bullet.