CHARGED FEE CALCULATION METHOD, CHARGED FEE CALCULATION DEVICE, AND PRINTER CHARGING SYSTEM

PROBLEM TO BE SOLVED: To attain a business model which does not cause either a person charging or a person charged to have any disadvantage.SOLUTION: A maker server 110 for calculating a charged fee of an ink jet printer includes: a charge status acquisition part 342 for acquiring charge status information including an actual printing used amount PV which is a used amount of ink used for actual printing except maintenance in a specific period L1; an actual printing used amount determination part 343 for determining whether the actual printing used amount PV is equal to or less than a prescribed amount V1; and a charged fee calculation part 344 for calculating a charged fee according to the actual printing used amount PV. The charged fee calculation part 344 calculates a charged fee as a first charged fee based on a total value of the prescribed amount V1 and a maintenance used amount MV which is a used amount of ink used for maintenance in the specific period L1 when the actual printing used amount PV is equal to or less than the prescribed amount V1, and as a second charged fee which increases depending on the actual printing used amount PV when the actual printing used amount PV is over the prescribed amount V1.