An effect display panel, in which a transparent liquid crystal panel for image effect and a liquid crystal film for an electronic shutter are laminated, is disposed in front of main reels. With an electronic shutter, shielding regions can be set by software. During ST gaming, control is executed so that reels, which should be subject to stop control, are indicated. Specifically, a display region of the reel to be stopped is controlled in a transmissive state and display regions of other reels are controlled in a shielding state.