An image display apparatus includes a selection unit configured to select as a display image a second tomographic image in the case where a second acquisition unit successfully acquires the second tomographic image or in the case where a correspondence relationship between a first tomographic image and the second tomographic image satisfies a predetermined condition, or select a notification image in a case other than the above-described cases, and a display unit configured to display the first tomographic image and the display image selected by the selection unit in parallel or in a superimposed manner.
