PROBLEM TO BE SOLVED: To easily improve image quality in an optical coherence tomographic imaging apparatus.SOLUTION: An optical tomographic image generation method includes: a first step of acquiring a signal of a plurality of frames a second step of converting the signal of the plurality of frames by Fourier conversion and each obtaining the data of complex number a third step of combining the plurality of frames using each of the complex number data and a fourth step of generating tomographic images based on the combined data.