1. An information processing apparatus comprising: a region acquisition unit configured to obtain a specific region of a subject in a first three-dimensional coordinate system; a tomographic image acquisition unit configured to obtain a tomographic image of the subject in a second three-dimensional coordinate system; a distribution acquisition unit configured to obtain a probability distribution of the existence of the specific region in the tomographic image based on a positional error between the first three-dimensional coordinate system and the second three-dimensional coordinate system; and a display control unit configured to cause a display unit to display a region indicating the probability distribution of the existence of the specific region in the obtained tomographic image.