Next, CPU 80a collates the acquired attachment and detachment record with the attachment and detachment instruction registered in instruction list L (S140), and determines whether the attachment and detachment of feeder 30 is performed according to the attachment and detachment instruction in instruction list L (S150). If the attachment and detachment instruction in which any of the feeder ID, the slot number, and the type of attachment and detachment match with those included in the attachment and detachment record is registered in instruction list L, CPU 80a determines that the attachment and detachment is performed according to the attachment and detachment instruction. When it is determined in S150 that the attachment and detachment is performed according to the attachment and detachment instruction, CPU 80a deletes the corresponding attachment and detachment instruction from instruction list L to update instruction list L (S160). Then, update information of instruction list L is output to loader 50 and component mounter 20 (S170). As the update information, because the attachment and detachment of feeder 30 based on the attachment and detachment instruction is already performed, information to delete the attachment and detachment instruction is output. Loader control device 59 that received the update information deletes the attachment and detachment instruction from the already received attachment and detachment instruction. Therefore, it is possible to prevent loader 50 from performing the automatic exchange of feeder 30 based on the attachment and detachment instruction in duplicate. In addition, in S170, CPU 80a may output update information to component mounter 20 targeted by the deleted attachment and detachment instruction. Mounting control device 28 of component mounter 20 that received the update information performs a process of deleting the attachment and detachment instruction from the display on display 27. Therefore, it is possible to prevent the operator from performing the exchange of feeder 30 based on the attachment and detachment instruction in duplicate. Therefore, it is possible to appropriately prevent the exchange of feeder 30 already performed by any one of loader 50 and the operator from being performed by the other.