[Object] To provide an information processing device, a control method, and a program capable of revitalizing real estate transactions while also protecting supplier-side privacy pertaining to real estate transactions. [Solution] An information processing device including : an alteration unit that alters a granularity of real estate information to be disclosed, in accordance with a supplier-side privacy disclosure level pertaining to a real estate transaction; and a decision unit that decides an evaluation value of real estate information altered by the alteration unit.