A medical information processing apparatus according to an embodiment includes processing circuitry. The processing circuitry is configured to obtain medical images taken at a plurality of points in time. The processing circuitry is configured to obtain structures of a plurality of tissues, from medical images taken at a first point in time and at a second point in time different from the first point in time among the plurality of points in time. The processing circuitry is configured to calculate a measurement value related to a contact part between the plurality of tissues at the first point in time, on the basis of the obtained structures of the plurality of tissues at the second point in time and the obtained structures of the plurality of tissues at the first point in time.