Step S25: when having determined that the sum “301” of the ordering numbers HM is not consistent with the integer multiple of any of the ordering standard numbers HKM in the step S24, the CPU 12 in the printing management apparatus PK serves as the calculation section 23 to increase or reduce the sum of the ordering numbers HM so as to make the sum of the ordering numbers HM consistent with an integer multiple of one of the ordering standard numbers HKM.

Here, the sum “301” of the ordering numbers HM is closest to “312” which is 13 times as many as the ordering standard number HKM “24”. Therefore, the CPU 12 increases or reduces the ordering numbers HM about the users US1 to US4 so as to make the sum of the ordering numbers HM consistent with “312”.

Specifically, the CPU 12 increases the ordering numbers HM about the four users US1 to US4, for example, by “2”, “3”, “3” and “3” (≈11/4) respectively so as to increase the sum of the ordering numbers HM by “11” (=312?301). Thus, the CPU 12 changes the ordering numbers HM about the users US1 to US4 to “81” (=79+2), “79” (=76+3), “77” (=74+3), and “75” (=72+3) respectively. In addition, the CPU 12 serves as a confirmation/resetting section 25 (shown in FIG. 8) to confirm the sum of the ordering numbers HM as “312”.