An image processing apparatus includes an ultrasonic image obtaining unit configured to obtain an ultrasonic image by capturing a subject by ultrasound, a generation unit configured to generate a corresponding cross-sectional surface which corresponds to an image capturing cross-sectional surface of the ultrasonic image, which is parallel to a reference direction, and which includes a position specified in advance from a three-dimensional image of the subject, and a cross-sectional image obtaining unit configured to obtain a cross-sectional image of the three-dimensional image from the generated corresponding cross-sectional surface.
