Electronic coupon system, contribution level calculation method, electronic coupon processing device, and electronic coupon processing program

摘要

An electronic coupon system adds identification information for specifying users to electronic coupons every time electronic coupons are distributed among users, and when the electronic coupons are used, the identification information added to the electronic coupons are acquired as a distribution history of the electronic coupons distributed among the users. A contribution level of each user is calculated by using the acquired distribution history.