1. A medical image-processing apparatus comprising: a display unit configured to display a plurality of medical images obtained at different imaging positions; a setting unit configured to set a point of interest on each of the medical images in accordance with an operation of an operator; an alignment unit configured to align the medical images on the display unit, with the points of interest on the medical images made to coincide with each other; and a post-processing unit configured to perform post processing concerning the medical images aligned by the alignment unit.