1. A calorimetric method of measuring a color printed on a printing material containing a fluorescent brightener under a predetermined viewing illuminant, using a computer to perform the steps of: an acquisition step of acquiring a first color patch and second color patch specified to match each other in appearance when a plurality of color patches formed on a printing material containing the fluorescent brightener and a plurality of color patches formed on a printing material free from the fluorescent brightener are compared under the predetermined viewing illuminant; a measurement step of performing calorimetric processing using spectrophotometric colorimetry for the first color patch and the second color patch to obtain a first calorimetric value and a second calorimetric value; and a calorimetric value correction step of correcting a calorimetric value output from a spectrophotometric calorimeter based on a relationship between the first calorimetric value and the second calorimetric value.