An information processing apparatus includes a first acquisition unit configured to acquire a plurality of positions, in a three-dimensional image of a subject, obtained based on a sternum of the subject, a second acquisition unit configured to acquire a plurality of positions, in the subject, obtained based on the sternum of the subject, and a calculation unit configured to calculate a correspondence relationship in position between the subject and the three-dimensional image based on the plurality of positions acquired by the first acquisition unit and the plurality of positions acquired by the second acquisition unit.