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; and displaying a stereoscopic image formed of two images of the right-eye and left-eye images on the display unit.