1. An information processing device comprising: first learning means for learning a first metadata estimation formula for estimating a first target variable of content on the basis of the feature quantity of the content; first error modeling means for determining a first model of an error generated in the estimation of the first target variable based on the first metadata estimation formula learned by the first learning means; first error generation means for generating, with the use of a random number, an error according to the first model determined by the first error modeling means; and first estimation means for estimating the first target variable of the content by using the first metadata estimation formula learned by the first learning means and the random number generated by the first error generation means.