Abstract: The present provides a mechanism of leaving, as a record, a fact that a correction of order details of an accepted order is proper in virtual shopping mall service. When modification of order details is received from a member store terminal 40 (S615), a virtual shopping mall management server 10 calculates the difference between an amount before the change and an amount after the change. When the difference is determined to be equal to or larger than a predetermined amount (Yes in S620), the server generates a settlement process request page and transmits it to the member store terminal 40 (S625a). When the settlement process request information is received from the member store terminal 40, the server transmits an e-mail requesting for approval on the change in the amount to a member terminal (S630a).

Abstract: A price which is applied when a user who receives information of a product is assumed to order this product is provided. An information providing device acquires a quantity which the user is expected to order as to a product specified in response to a request from the user, acquires a price of the product for which sale is determined according to an order quantity corresponding to a sum of the acquired quantity and a quantity of the specified product ordered so far, from a combination of the price of the product and the order quantity, and outputs the acquired price.

Abstract: The present provides a mechanism of leaving, as a record, a fact that a correction of order details of an accepted order is proper in virtual shopping mall service. When modification of order details is received from a member store terminal 40 (S615), a virtual shopping mall management server 10 calculates the difference between an amount before the change and an amount after the change. When the difference is determined to be equal to or larger than a predetermined amount (Yes in S620), the server generates a settlement process request page and transmits it to the member store terminal 40 (S625a). When the settlement process request information is received from the member store terminal 40, the server transmits an e-mail requesting for approval on the change in the amount to a member terminal (S630a).