An optical tomographic imaging system configured to split light emitted from a light source into measuring light and reference light, configured to radiate the measuring light onto a measuring subject, configured to combine reflection light from the measuring subject with the reference light, configured to detect interfered light obtained by combining the reflection light with the reference light as an interference signal, and configured to Fourier-transform the interference signal to acquire a tomographic image of the measuring subject, the optical tomographic imaging system comprising: a tomographic data generating unit configured to generate tomographic data of the measuring subject based on the interference signal; and a tomographic image constructing unit configured to construct a tomographic image that is based on the tomographic data generated by the tomographic data generating unit; a surface data generating unit configured to carry out processing in parallel with the tomographic data generating unit and configured to generate surface data of the measuring subject based on the interference signal; a surface image constructing unit configured to construct a surface image that is based on the surface data generated by the surface data generating unit; and a display image generating unit configured to generate a display image from the tomographic image and the surface image, characterised in that the light source is a wavelength sweep light source and in that the surface data generating unit includes: an absolute value converting unit configured to output absolute value data in which an amplitude value of the interference signal is converted into an absolute value; and an interference waveform data integrating unit configured to entirely integrate the absolute value data in a temporal direction. a tomographic data generating unit configured to generate tomographic data of the measuring subject based on the interference signal; and a tomographic image constructing unit configured to construct a tomographic image that is based on the tomographic data generated by the tomographic data generating unit; a surface data generating unit configured to carry out processing in parallel with the tomographic data generating unit and configured to generate surface data of the measuring subject based on the interference signal; a surface image constructing unit configured to construct a surface image that is based on the surface data generated by the surface data generating unit; and a display image generating unit configured to generate a display image from the tomographic image and the surface image, characterised in that the light source is a wavelength sweep light source and in that the surface data generating unit includes: an absolute value converting unit configured to output absolute value data in which an amplitude value of the interference signal is converted into an absolute value; and an interference waveform data integrating unit configured to entirely integrate the absolute value data in a temporal direction. an absolute value converting unit configured to output absolute value data in which an amplitude value of the interference signal is converted into an absolute value; and an interference waveform data integrating unit configured to entirely integrate the absolute value data in a temporal direction.