1. An image processing apparatus comprising: an image combining unit configured to generate a combined image, by setting one of a plurality of images as a basic image, and disposing a moving image generated from the plurality of images in a moving image area which is designated in part of the basic image to thereby perform image combining; a display unit configured to display the basic image; a setting unit configured to set a still area in part of the basic image; and a designation unit configured to designate the moving image area, according to a touch operation performed on a display surface of said display unit on which the basic image is displayed, wherein in a case where the moving image area is designated in a manner overlapping the still area, said image combining unit performs image combining processing by deleting the overlapping area from the moving image area.