1. An equipment evaluation system comprising a computer including a processor, comprising: an estimator implemented by the computer, to estimate a probability density distribution of a parameter representing performance of subject equipment based on measurement data of the subject equipment, the measurement data resulting from a measurement performed at each of a plurality of times; an acquirer implemented by the computer to acquire a use pattern of the subject equipment; a hardware storage to store the use pattern in association with the probability density distribution for the subject equipment; and an evaluator implemented by the computer to identify a use pattern of the subject equipment, the use pattern being similar to a use pattern of a first equipment that is different from the subject equipment, and evaluating future performance degradation of the first equipment using probability density distributions corresponding to the identified use pattern.