1. An image display apparatus comprising: a region-of-interest setting unit that sets a region of interest on each of a plurality of images that is imaged by a diagnostic imaging apparatus and includes a same portion of a subject; a feature analysis unit that performs a feature analysis on each of the images based on pixel values of pixels included in the region of interest set by the region-of-interest setting unit; and a display control unit that causes a display unit to display the images in a substantially same position in a display area included in the display unit by switching the images in an order prescribed, and to display a result of the feature analysis obtained by the feature analysis unit in same display area.