1. A radiological breast image display method for generating, based on four images of a right-side capturing image and a left-side capturing image of each of left and right breasts captured so as to have a parallax in a left-right direction, two images of right-eye and left-eye images, each representing the left and right breasts in the same image, and displaying a stereoscopic image formed of two images of the right-eye and left-eye images on a display unit capable of displaying the stereoscopic image, the method including the steps of: providing one of the right-eye and left-eye images by combining one of the right-side capturing image and the left-side capturing image of the right breast with one of the right-side capturing image and the left-side capturing image of the left breast such that the chest walls of the breasts face to each other and the other of the right-eye and left-eye images by combining the other of the right-side capturing image and the left-side capturing image of the right breast with the other of the right-side capturing image and the left-side capturing image of the left breast such that the chest walls of the breasts face to each other, wherein the image combining is performed such that front-back directions of the left and right breasts agree with each other in the stereoscopic image, wherein: one of the right-eye and left-eye images is provided by combining the right-side capturing image of one breast with the left-side capturing image of the other breast rotated by 180Â° among the left and right breast images such that the chest walls of the breasts face to each other, and the other of the right-eye and left-eye images is provided by combining the left-side capturing image of the one breast with the right-side capturing image of the other breast rotated by 180Â° among the left and right breast images such that the chest walls of the breasts face to each other, for matching the front to back directions of the right and left breasts; and displaying a stereoscopic image formed of two images of the right-eye and left-eye images on the display unit.