Method for judging unauthorized use of point information and promotion system

摘要

A method for judging unauthorized use of point information and a promotion system, which realize effective use of a point issue number added to the point information. Of the used point numbers, only the numbers contained in a predetermined range are stored. If the point issue number of the point information sent from the user lies in the predetermined range, whether or not it has been used is confirmed by comparing it with the used point issue number stored.