An image display apparatus includes a display unit; a storage unit; and a processor configured to make the display unit display an image including a plurality of ruled lines, to detect coordinates designated by a user by an input operation on a display screen of the display unit, and to obtain a trajectory of the detected coordinates, and to make the display unit enlarge a part of the image including the ruled lines by an enlargement rule selected based on an arrangement of intersections of the trajectory of the obtained coordinates and the ruled lines, and display the enlarged part of the image.