1. An image display apparatus comprising: a display unit configured to display an image; an information acquisition unit configured to extract a target image from a display image to be displayed by the display unit, to extract a comparison image for comparison from the display image at a timing different from the target image, to cut first and second regions from the extracted target image, to cut third and fourth regions from the extracted comparison image, and to obtain an image feature quantity of each of the first to fourth regions; a comparison unit configured to perform comparison of the image feature quantity of the first region and the image feature quantity of the third region, and to perform comparison of the image feature quantity of the second region and the image feature quantity of the fourth region; and a feature quantity setting unit configured to perform weighting to the first region and the second region based on the comparison result of the comparison unit, and to obtain an image feature quantity of the entire target image based on the result of weighting.