1. An optical tomographic image photographing apparatus, including: an optical coherence tomography (OCT) optical system for capturing tomographic images of an object to be examined, the OCT optical system including: a light source; a splitter for splitting a light from the light source into a measurement optical path and a reference optical path; an optical scanner placed in the measurement optical path and for scanning light on the object to be examined; and a detector for detecting a spectrum of light obtained by combining the light of the measurement optical path reflected from the object and the light from the reference optical path; a drive unit placed to move at least a part of optical components provided in the OCT optical system in an optical axial direction to adjust a difference in optical path length between the measurement optical path and the reference optical path; a monitor placed to output at least the tomographic image; and a display controller for displaying, on the monitor alongside the tomographic image, identifying information used to determine whether the tomographic image output to the monitor is a normal image or a reverse image.