1. A tomographic image display device comprising: three-dimensional data generation means for generating three-dimensional volume data showing a generation position of radiation in a region of interest of a subject based on the radiation generated from the region of interest; central axis setting means for setting a predetermined axis in the subject as a central axis; alignment means for setting a three-dimensional position of the three-dimensional volume data to a three-dimensional position of the region of interest with respect to the central axis; MIP image generation means for generating an MIP image which is a maximum intensity projection image by projecting a maximum pixel value in one or more projection directions orthogonal to the central axis with respect to the three-dimensional volume data in which the three-dimensional position is set by the alignment means; tomographic image generation means for generating a tomographic image at a predetermined slice surface of the three-dimensional volume data; and image display means for displaying the MIP image and the tomographic image.