1. An image processing apparatus comprising: a displaying part; a light source generating light; a display driving part displaying an image on the displaying part by controlling an intensity of the light generated by the light source on the basis of one of a plurality of image signals; a light shutting part passing or blocking the light generated by the light source; and a controlling part controlling the light shutting part to block the light generated by the light source while the image signal which has been displayed on the displaying part is being changed into another one of the plurality of image signals.