1. An image processing apparatus for generating a reconstructed image by performing a reconstruction process including a repetitive operation using a plurality of operation units, comprising: an obtaining unit configured to obtain a plurality of measurement data from a measurement apparatus for obtaining the plurality of measurement data of an object; a first division unit configured to divide the plurality of measurement data into a plurality of subsets; a first distribution unit configured to distribute the measurement data included in the plurality of subsets to the operation units in each repetitive operation; a second division unit configured to divide an image region into a plurality of regions; a second distribution unit configured to distribute the plurality of regions to the operation units; a reconstruction processing unit configured to update 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 a combining unit configured to combine the partial reconstructed images to generate the reconstructed image.