[Object] To provide information useful to a variety of users engaged in real estate transactions. [Solution] Provided is an information processing device, including : an information extraction unit that extracts information related to a second real estate property or a second transaction similar to a first real estate property or a first transaction occurring with respect to the first real estate property, on a basis of features of a real estate property or a transaction with respect to a real estate property; and a transaction result prediction unit that predicts a transaction result including a first price associated with the first real estate property in the first transaction, on a basis of the extracted information.