Provided are an image display apparatus, a radiation imaging display system, an image display method, and an image display program capable of accurately displaying, in performing image diagnosis by performing cross reference between a two-dimensional radiation image and tomographic images, a tomographic image corresponding to a designated position on the two-dimensional radiation image.An image display apparatus includes a depth map creating unit that creates, on the basis of a two-dimensional radiation image and a plurality of tomographic images for the same subject, a plurality of depth maps in which each position on the two-dimensional radiation image and depth information indicating a depth directional position of a tomographic plane corresponding to each position are associated with each other while changing a correspondence relationship between each position on the two-dimensional radiation image and the depth information.
