A method of generating a tomographic image using optical coherence tomography includes: a data obtaining step of obtaining a plurality of pieces of tomographic image data each indicating a tomogram at substantially the same position of an object； a removing step of removing an outlier from the plurality of pieces of tomographic image data； a computation step of computing a motion contrast value based on the plurality of pieces of tomographic image data from which the outlier is removed； and a generation step of generating a motion contrast image of the object based on the motion contrast value.
