In an image processing apparatus, Whether image quality of a tomographic image corresponding to a predetermined position in an imaging target captured by an optical coherence tomography apparatus is within a predetermined range is determined, an instruction whether to permit the image capturing in the predetermined position is issued to the optical coherence tomography apparatus according to a determination that the image quality is out of the predetermined range, and a new tomographic image is generated by combining the tomographic image obtained according to the instruction and the tomographic image whose image quality is determined.