1. A medical image diagnostic apparatus comprising: an accepting unit configured to accept input of conditions with respect to regions to be photographed and arrangement of the regions; an extracting unit configured to extract an area of interest of each subject by analyzing medical image data photographed based on the conditions accepted by the accepting unit; and a setting unit configured to set display conditions of a parallax image group to be displayed on a display unit having a stereoscopic viewing function, based on the conditions and on the area of interest extracted by the extracting unit.