1. An image processing apparatus that analyzes a pathology image obtained by imaging an analysis object comprising: a setting device for calculating an amount of a luminance difference characteristic as an amount of characteristic of each pixel of a pathology image, and for setting a cellular tissue region in the pathology image, based on the amount of the luminance difference characteristic, using a cellular tissue detector that has studied in advance, wherein the cellular tissue detector has studied in advance by statistical learning that uses an image corresponding to a cellular tissue.