An image processing apparatus for sharing image processing for an image area by a plurality of processors, analyzes a tendency of compositing input pixel information in the image area, determines a share of tasks to be executed by each of the plurality of processors based on the analysis result, and controls the share of tasks by each of the plurality of processors in accordance with the determined share of tasks. For example, when the plurality of processors include a first processor which executes a generation process of pieces of pixel information for respective layers to be composited, and a second processor which composites the pieces of generated pixel information, the requirement or complexity of a compositing processing, or the size of area in which the compositing processing is performed is analyzed, so as to control the share of tasks or a communication method of the first and second processors.