A printing surface processing method includes first forming, second forming and applying. In the first forming, a substantially flat first image expressed with unevenness sense based on a touch and/or a stroke of a brush is formed on a first face of a thermal expansion sheet. In the second forming, a second image constituted of a grayscale image is formed on a second face of the sheet. The grayscale image includes a dark portion and a light portion with densities set to form a substantially uneven shape on the first face. The uneven shape corresponds to the unevenness sense of the first image and unevenness sense of fabric where the first image is supposed to be formed. In the applying, thermal energy is applied to the second image to expand the sheet to form the uneven shape on the first face.