1. A color processing method of matching a color appearance of a first recoding medium to a color appearances of a second recording medium, comprising the steps of: acquiring a profile of the first recording medium, wherein the profile holds correspondence between colorimetric signals and color data of a device; obtaining correspondence between a color on the first recording medium and a color on the second recording medium by visual observation; calculating a difference between color information indicating the color on the first recording medium and color information indicating the color on the second recording medium; and correcting the colorimetric signals in the profile of the first recording medium using the difference.