An image processing system according to the present invention includes a display device (150) that includes an interface (152) that receives image data through a receiving device (130) from a capsule medical device (10) having an imaging unit (11)； a CPU (133) that specifies an orientation with respect to a reference direction (Ds) of the capsule medical device (10) at the time of capturing the image data； and a rotation correcting unit (154a) that aligns the plurality of pieces of image data by performing the orientation correction on the image data based on the orientation specified by the CPU (133).
