An optical coherence tomographic device of polarization-sensitive type, comprising: an image capturing unit configured to capture a tomographic images of a subject eye; a display unit configured to display the tomographic images captured by the image capturing unit; and an input device, wherein the tomographic images comprise at least two tomographic images selected from a group consisting of: a tomographic image showing a tissue in the subject eye by scattering intensity, a tomographic image showing a melanin distribution in the subject eye, a tomographic image showing a fiber density in the subject eye, a tomographic image showing a fiber direction in the subject eye, and a tomographic image showing a blood flow in the subject eye, wherein each of the tissue, the melanin distribution, the fiber density, the fiber direction and the blood flow shown in the respective tomographic images is a characteristic of the respective tomographic image, and the display unit is configured to display the at least two tomographic images at a same position and on a same cross section such that the at least two tomographic images are superimposed on each other, characterized in that the input device is configured to input a numerical range of an index indicating the respective characteristic shown in each of the at least two tomographic images, wherein the numerical range of the respective index is to be displayed for each of the at least two images, and the display unit is configured to display each of the at least two images according to the respective numerical range inputted through the input device. an image capturing unit configured to capture a tomographic images of a subject eye; a display unit configured to display the tomographic images captured by the image capturing unit; and an input device, wherein the tomographic images comprise at least two tomographic images selected from a group consisting of: a tomographic image showing a tissue in the subject eye by scattering intensity, a tomographic image showing a melanin distribution in the subject eye, a tomographic image showing a fiber density in the subject eye, a tomographic image showing a fiber direction in the subject eye, and a tomographic image showing a blood flow in the subject eye, wherein each of the tissue, the melanin distribution, the fiber density, the fiber direction and the blood flow shown in the respective tomographic images is a characteristic of the respective tomographic image, and the display unit is configured to display the at least two tomographic images at a same position and on a same cross section such that the at least two tomographic images are superimposed on each other, characterized in that the input device is configured to input a numerical range of an index indicating the respective characteristic shown in each of the at least two tomographic images, wherein the numerical range of the respective index is to be displayed for each of the at least two images, and the display unit is configured to display each of the at least two images according to the respective numerical range inputted through the input device. a tomographic image showing a tissue in the subject eye by scattering intensity, a tomographic image showing a melanin distribution in the subject eye, a tomographic image showing a fiber density in the subject eye, a tomographic image showing a fiber direction in the subject eye, and a tomographic image showing a blood flow in the subject eye, wherein each of the tissue, the melanin distribution, the fiber density, the fiber direction and the blood flow shown in the respective tomographic images is a characteristic of the respective tomographic image, and the display unit is configured to display the at least two tomographic images at a same position and on a same cross section such that the at least two tomographic images are superimposed on each other, characterized in that the input device is configured to input a numerical range of an index indicating the respective characteristic shown in each of the at least two tomographic images, wherein the numerical range of the respective index is to be displayed for each of the at least two images, and the display unit is configured to display each of the at least two images according to the respective numerical range inputted through the input device.