A display control apparatus performs control to display a designation object for designating a tomographic position corresponding to each of a plurality of tomographic images, and a tomographic image corresponding to a designated tomographic position. For a tomographic image with additional information that includes user-added additional information and computer-added additional information and that is set to be added on a tomographic-image by tomographic-image basis, the display control apparatus performs control to display a marking representing the additional information at a position corresponding to a tomographic position of the tomographic image with the additional information on the designation object. If the additional information is added to the tomographic image corresponding to the designated tomographic position, the display control apparatus performs control to display the marking representing the additional information in an emphasized manner.