An apparatus comprises a unit which stores a size and scene information for each of a plurality of divided areas obtained by dividing an input image, a unit which obtains a plurality of scene-based images by processing the input image based on the scene information of the plurality of divided areas, a unit which determines composite ratios of the plurality of scene-based images by determining, for each of the plurality of divided areas, a transition pattern of a composite ratio from a first composite ratio within the divided area to a second composite ratio within an area other than the divided area based on the size of the divided area, and a unit which composites the plurality of scene-based images in correspondence with the plurality of the divided areas, in accordance with the determined composite ratios.