1. An image processing apparatus which processes a tomogram of an eye region, the image processing apparatus comprising: a processor; and a memory storing instructions that, when executed by the processor, cause the image processing apparatus to: acquire a predetermined layer area from the tomogram; change an algorithm for acquiring, based on information extracted from the predetermined layer area, diagnosis information as information to be used for diagnosis of the eye region from the tomogram; and acquire the diagnosis information from the tomogram based on the changed algorithm.