A first registration unit performs first registration between a live view and an associated image associated with an object to be imaged. A second registration unit performs second registration between the object captured in the live view and the associated image based on the result of the first registration. At least while the second registration is performed, a display control unit superimposes the associated image on the object captured in the live view, and displays an enlarged view of a partial region of the live view, on which the associated image is superimposed. The second registration unit performs the second registration using a region of the live view larger than the partial region while the enlarged view of the partial region of the live view is displayed.
