An image processing apparatus configured to process an ultrasound image includes a three-dimensional image acquisition unit configured to acquire a three-dimensional image obtained by capturing an object in a first deformed state, a tomographic image acquisition unit configured to acquire an ultrasound tomographic image obtained by capturing a particular cross section of the object in a second deformed state, a generation unit configured to generate a curved cross section image corresponding to the ultrasound tomographic image in the first deformed state, based on a conversion rule between the first deformed state and the second deformed state, and a display control unit configured to display the generated curved cross section image and the three-dimensional image in an aligned state on a display unit.