A medical diagnostic apparatus includes: a feature calculating unit configured to calculate a plurality of kinds of features based on a received signal from a specimen; a classification unit configured to classify attributes of a tissue of the specimen by using a feature determined among the plurality of kinds of features calculated by the feature calculating unit according to a classification item selected in advance, and configured to assign visual information according to a classification result to pixels of an image based on the received signal; and a feature image data generating unit configured to generate feature image data on which the visual information assigned to the pixels of the image based on the received signal is superimposed.