1. An image display method, comprising: acquiring a first image within a first area of an object to be inspected; acquiring interference signal sets corresponding to a plurality of frames, which are acquired with an intention to acquire the same cross section, for a plurality of different cross sections; generating, based on the interference signal sets corresponding to the plurality of frames, a motion contrast image within a second area included in the first area; and superimposing, for display, information acquired from a part of the motion contrast image onto a corresponding position of the first image.