To provide information useful to a variety of users engaged in real estate transactions. Provided is an information processing device, including an appraisal value calculation unit that calculates an appraisal value of a real estate property by using a function which includes appraisal factors of the real estate property as variables and which is different depending on a location of the real estate property, an appropriate price calculation unit that calculates an appropriate price of the real estate property based on the appraisal value, an assessment creation unit that creates an assessment of the real estate property that includes the appropriate price, and a display control unit that causes the assessment to be displayed on a client device.