For example, the electronic circuit board data is stored in electronic circuit board data memory section 160 from a host computer that manages information required for the operation of the entire factory including mounting line 12 via the communication section 140 by an operator controlling operation device 24 while watching the display of display device 26. The components 150 and 152 to be mounted by each mounting module 10 are basically determined such that all the multiple suction nozzles 80 held by the rotation holding body 68 of one mounting module 10 are the same. In so doing, operation efficiency is improved.