An operation parameter determination apparatus (101) has an ID detecting unit (107) to detecting a plurality of ID codes by using a non-contact ID reader (102), an ID/operation parameter table (105) describing correspondence between ID codes and operation parameters, an operation parameter retrieval unit (106) to refer to the ID/operation parameter table (105) to retrieve operation parameters corresponding to the respective detected ID codes, and an operation parameter integration unit (109) to, if there are operation parameters inconsistent with each other among the retrieved operation parameters, adjust the parameters to consistent with each other to solve inconsistency.