An image display apparatus according to the present invention includes: an acquisition unit configured to acquire a size of a flat region on the basis of an input image, this flat region, from among regions of the input image, being a region in which a change in gradation value in a spatial direction of the image is small; and an image processing unit configured to perform unevenness reduction processing on the input image, this unevenness reduction processing reducing at least one of brightness unevenness and color unevenness of a screen at a higher reduction degree as the flat region is larger in size.