Abstract: An information processing device obtains information on a value for each locality, the value for each locality corresponding to a currency value for each locality, further obtains information on a currency exchange rate, sets a conversion rate for the values between the localities, transmits information on a value applicable for a user, the information on the value applicable for the user being information necessary for a terminal device to present a payment procedure screen for electronic-commerce by a currency of a first locality, and executes, in response to a request for applying a value of a second locality, a process of converting the applied value of the second locality into a currency value of the first locality by the conversion rate at a predetermined time point, and of putting the converted currency value to use in a settlement amount in the electronic-commerce.