1. A method for estimating a food commodity intake comprising: (a) obtaining a food intake of a food searched as a subject to be estimated for food commodity intake based on food intake database; (b) obtaining a material mix ratio of the food searched based on the material mix ratio database and estimating a material mix ratio intake using the food intake; (c) detecting whether or not the material contained in the material mix ratio intake estimation results is a food commodity; (d) accumulating a weight data of the material that is detected to be a food commodity among the materials obtained from the material mix ratio intake estimation results; (e) repeatedly performing operations (b) to (d) on materials that are not food commodities, until all of the materials contained in the material mix ratio intake estimation results become food commodities; and (f) summing the accumulated weight data of each food commodity to estimate a food commodity intake of the food, when all of the materials contained in the material mix ratio intake estimation results are food commodities.