In a tomographic image display device, an MIP-axis setting unit sets a predetermined axis of a subject as an MIP-axis. A position information calculation unit sets each position of three-dimensional volume data obtained for different regions of interest at three-dimensional positions corresponding to positional relationships between the MIP-axis and the region of interest. A three-dimensional data integration unit integrates each of the three-dimensional volume data in which three-dimensional positions are set into single three-dimensional data, and an MIP image generation unit projects an MIP image onto the integrated three-dimensional data in one or more projection directions orthogonal to the MIP-axis. In the MIP image, projection images of each of three-dimensional volume data are projected at positions corresponding to a positional relationship between the MIP-axis and the regions of interest. Consequently, by referring to a single MIP image, diagnoses can be performed by associating a plurality of regions of interest with a position of a predetermined axis of a subject.
