A method for creating a color conversion table for performing color conversion from a first print data including only color values of process colors to a second print data including color values of a spot color and color values of process colors, the method comprising: an evaluation step (S110, S120) of including a granularity check chart printing step of printing a granularity check chart including a plurality of patches corresponding to respective combinations of a color value of a spot color and a color value of process colors, and evaluating granularity for the plurality of patches included in the granularity check chart, an unusable region setting step of determining an unusable region that is a region corresponding to patches in which the granularity is not acceptable among the plurality of patches corresponding to respective combinations of a color value of a spot color and a color value of process colors, based on evaluation results obtained in the evaluation step (S110, S120), an association step of determining corresponding relationships among a color value of process colors before the color conversion, a color value of a spot color after the color conversion, and a color value of process colors after the color conversion by obtaining a minimum color value of process colors in which the granularity is acceptable for each color value of a spot color based on the unusable region, setting relationships between a color value of process colors before the color conversion and a color value of a spot color after the color conversion, and determining a color value of process colors after the color conversion corresponding to a color value of a spot color after the color conversion in consideration of the minimum color value of process colors in which the granularity is acceptable, and a table creation step of creating the color conversion table so that the corresponding relationships determined in the association step are satisfied, wherein in the unusable region setting step, a range of color values of process colors that is associated with the unusable region is determined for each color value of a spot color. an evaluation step (S110, S120) of including a granularity check chart printing step of printing a granularity check chart including a plurality of patches corresponding to respective combinations of a color value of a spot color and a color value of process colors, and evaluating granularity for the plurality of patches included in the granularity check chart, an unusable region setting step of determining an unusable region that is a region corresponding to patches in which the granularity is not acceptable among the plurality of patches corresponding to respective combinations of a color value of a spot color and a color value of process colors, based on evaluation results obtained in the evaluation step (S110, S120), an association step of determining corresponding relationships among a color value of process colors before the color conversion, a color value of a spot color after the color conversion, and a color value of process colors after the color conversion by obtaining a minimum color value of process colors in which the granularity is acceptable for each color value of a spot color based on the unusable region, setting relationships between a color value of process colors before the color conversion and a color value of a spot color after the color conversion, and determining a color value of process colors after the color conversion corresponding to a color value of a spot color after the color conversion in consideration of the minimum color value of process colors in which the granularity is acceptable, and a table creation step of creating the color conversion table so that the corresponding relationships determined in the association step are satisfied, wherein in the unusable region setting step, a range of color values of process colors that is associated with the unusable region is determined for each color value of a spot color.