PRICE DETERMINATION SYSTEM, PRICE DETERMINATION SYSTEM CONTROL METHOD, PROGRAM, AND INFORMATION STORAGE MEDIUM

摘要

A price variation unit (32) acquires user group data from a price variation means which causes the current price of data to be purchased which a user purchases to vary, and a means which stores user group data which associates a first user with a second user. When the first user purchases the data to be purchased, a price determination means (34) determines, as a price of the data to be purchased when the second user which is associated with the first user purchases the data to be purchased, a price which differs from the current price of the data to be purchased which is varied by the price variation unit on the basis of the price of the data to be purchased when the first user purchased the data to be purchased.