An image formation system includes I storage units, an assignment unit that assigns to the storage units storage destinations of color component data forming a part of image data, J color component image formation units that form color component images of corresponding colors based on color component data stored in the storage units, and an image formation unit that forms an image of the image data based on the formed color component image, wherein the assignment unit includes a J-color assignment unit that assigns to the I storage units storage destinations of J sets of color component data forming a part of J-color image data, and an L-color assignment unit that assigns a storage destination of L sets of color component data forming a part of L-color image data to N storage units among the I storage units, and each of I, J, and N is a natural number greater than or equal to 2, L is a natural number greater than or equal to 1, L