1. An image processing device for processing a plurality of images represented by captured image data obtained by a camera array image capturing device including a plurality of image capturing units, the image processing device comprising: a determining unit configured to determine, on the basis of a display angle of the images in a display region, an arrangement of each image in the display region corresponding to each of the plurality of image capturing units, wherein the arrangement of each image in the display region is determined based on the arrangement of the plurality of image capturing units.