An image processing obtains a plurality of measurement data from a measurement apparatus for obtaining the plurality of measurement data of an object, divides the plurality of measurement data into a plurality of subsets, distributes the measurement data included in the plurality of subsets to operation units in each repetitive operation, divides an image region into a plurality of regions, distributes the plurality of regions to the operation units, updates a result obtained by each operation unit in the distributed region information using the distributed measurement data, thereby performing the reconstruction process and generating a partial reconstructed image on each operation unit, and combines the partial reconstructed images to generate the reconstructed image.