1. A photography apparatus for acquiring a plurality of polarization-sensitive tomographic images of an object using information about light having polarization different from each other, combined light being obtained by combining return light from the object irradiated by measurement light and reference light corresponding to the measurement light, the combined light being split into the light having polarization different from each other, the photography apparatus comprising: a selecting unit configured to select one of a plurality of photography modes, including a follow up photography mode; a tomographic image acquiring unit configured to acquire the plurality of polarization-sensitive tomographic images obtained by photographing the object at different times; and a positioning unit configured to, in a case where the follow up photography mode is selected, position the plurality of polarization-sensitive tomographic images using information about a plurality of polarization planar images of the object corresponding to the plurality of polarization-sensitive tomographic images.