Image processing apparatus, image processing method, and non-transitory computer-readable storage medium

An image processing apparatus comprises one or more processors, wherein the one or more processors function as: a first obtaining unit configured to obtain a plurality of images having an overlapping region which is a region that is captured by overlapping at least a portion of a capturing target, a second obtaining unit configured to obtain in-focus degree information in the overlapping region of each of the plurality of images, wherein the in-focus degree information indicates a degree of focus for each predetermined region of the image, and a compositing unit configured to, based on the in-focus degree information of each of the plurality of images, generate a composited image for which the plurality of images are composited.