[Problem] To provide an information processing device, a control method, and a program with which it is possible to revitalize real-estate transactions while protecting supplier-side privacy pertaining to real-estate transactions. [Solution] Provided is an information processing device provided with an alteration unit for altering the granularity of real estate information to be disclosed in accordance with an openness to the public of supplier-side privacy pertaining to real-estate transactions, and a determination unit for determining the evaluation value of the real-estate information altered by the alteration unit.