This invention is directed to appropriately searching for case data similar in the process of a disease. A similar case search apparatus (100) according to this invention includes a disease progress model building function of building a disease progress model by extracting feature amounts from a plurality of medical images obtained by imaging the same object in different periods, a unit configured to read out case data, a unit configured to acquire inspection data, a similar case search function of interpolating, by using the model, feature amounts extracted from the plurality of medical images contained in the inspection data, and calculate a similarity between the inspection data and the case data by using the interpolated feature amounts, and a monitor (111) which displays case data selected based on the calculated similarity.
