1. An image display apparatus for displaying a series of images captured at multiple time points and a time scale indicating an imaging period of the series of images, comprising: an average color calculator that calculates area average-colors, with a respective area average-color for each of a plurality of divided image areas, said divided image areas being prepared by dividing each image among the series of images in a lateral dividing direction on a display; and: a display controller that is configured to cause two or more of the area average-colors of the divided image areas that are associated with respective divided image areas to be displayed on the display, the divided image areas being prepared by dividing a display area at each time point on the time scale in the lateral direction on the display so as to be associated with the respective divided image areas, wherein the divided image areas are arranged on the image display apparatus along said lateral direction and said lateral direction extends substantially perpendicular to an extending direction of the time scale.