A correction unit corrects gradation of pixels of a processing-target image signal for the right eye or the left eye. A writing unit writes the corrected image signal into display pixels of an image displaying unit. A reached level calculation unit calculates a reached gradation which is a gradation to be reached by each display pixel after one sub-frame period after the corrected image signal is written into the display pixel, on the basis of response characteristics of the display pixel, respectively. A timing controlling unit controls opening/closing timing of the glasses according to writing timing of the writing unit. The correction unit corrects the gradation of the pixels of the processing-target image signal, respectively, on the basis of a difference between the writing timing of the writing unit and the opening/closing timing of the glasses, and the reached gradation of the pixels in an immediately previous sub-frame.