An approximate blending search system includes a material information database constituted by accumulating names of a plurality of blending materials and property information codes constituted by a plurality of identification codes to which a plurality of pieces of property information on the blending materials are respectively related, a blending composition database constituted by accumulating names of compositions, names, property information codes, and blending quantities of the blending materials constituting the compositions, a prospective composition search unit for approximately searching a corresponding composition from the blending composition data base in accordance with the measurement data input from the input means and/or at least one or more identification codes of the property information codes in an optical blending material, and a display unit for displaying an obtained search result.