To provide a device production system which automatically confirms whether or not hardware different by customer orders is mounted as specified, and also manages accessory kinds different by the customer orders and automatically confirms whether they are excessive or deficient.

The device production system is equipped with a mounting confirming mechanism, judges the mounting positions of mount slots, etc., for a CPU and a memory described in received order information, stores expected values of expected mount position in a confirming means, and outputs it. Further, an accessory checking mechanism is provided, and a generating means generates corresponding expected values of accessory data by order information by using options described in the received order information as retrieval keys and identification information given to an accessory which is actually attached is read out and a comparing compares the actual value of the accessory data with the expected value to decide whether the accessory is good or not.