To reduce an observer's fatigue in displaying a stereoscopic image of radiation images.

A subject is imaged from two different imaging directions using an imaging assist implement such as a pressure plate, and two radiation images for displaying the stereoscopic image are acquired. A boundary detecting part 8c detects a boundary between a first region without the presence of the imaging assist implement and a second region with the presence of the imaging assist implement in each of the two radiation images. A correction processing part 8d performs correction processing for equalizing the brightness of the first and second regions in the two radiation images. A display control part 8f displays, on a monitor 9, the stereoscopic image based on the two radiation images subjected to correction processing.