The present invention is provided with: an extraction unit which extracts, from information indicating the physiology of a subject, first information indicating a physiological state of the subject, and second information indicating the emotions and/or the organ activity of the subject; a calculation unit which obtains a degree of similarity for the change indicated over time by the extracted first information and second information, and calculates, on the basis of the obtained degree of similarity, a deviation amount from a prescribed state at which homeostasis is maintained in the subject; and an estimation unit which estimates, on the basis of the calculated deviation amount, the pathology of the subject.