Image display device and image display method

Disclosed is an image display device including an image signal input section (2), an overshoot operation section (3) that, when an image signal is inputted from outside one frame at a time, corrects the gradation level of the inputted image signal for a frame, a frame memory (4) that stores the corrected image signal of the frame, and a sub-frame division processing section (5) that time-divides the corrected and stored image signal of the frame into a plurality of sub-frame periods. The overshoot operation section (3) corrects the gradation level of an image signal of a frame according to a relation between the corrected gradation level of the image signal of a frame immediately preceding the frame, which is stored of the frame memory (4), and the gradation level of the image signal of the frame. Thus, the costs can be reduced, the device can be made compact, and the power consumption can be suppressed.