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 of respective divided image areas prepared by dividing each image among the series of images into predetermined image areas; and a display controller that controls to display the area average-colors of divided image areas that are associated with respective divided scale areas, on the divided scale areas which are prepared by dividing a display area of each time point on the time scale in association with the respective divided image areas.