PROBLEM TO BE SOLVED: To provide a cellular phone call charge adjusting method for offsetting cost of phone calls for airline mileage.;SOLUTION: This cellular phone call charge adjusting method comprises: a first means for registering rental cellular phone information, airline mileage information, and customer information into a rental agent server 10; a second means for letting a mobile communication operator server 30 start mobile communication service for a rental cellular phone 60; a third means for letting the rental agent server 10 obtain the information about call of the cellular phone 60 from the mobile communication operator server 30; a fourth means for letting the rental agent server 10 process and offset charge of calls of the cellular phone 60 and airline mileage by using a ratio of offsetting and informing the mobile communication operator server 30 and an airline server 20 of the results of offsetting processing; and a fifth means for letting the airline server 20 delete amount of offset charge of charge of calls of the cellular phone 60 from the mileage and updating the mileage.;COPYRIGHT: (C)2009,JPO&INPIT
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