A board work system operable by a plurality of operators assigned in turn to operate. The system includes (a) at least one device changeable to each one of a plurality of different modes; (b) a control device which controls the changeable device, and receives operator ID data identifying each operator, so as to recognize which one of the operators is currently assigned to operate the system; and (c) an ID-data input device operable to input the operator ID data to the control device. The control device includes: (b-1) a suitable-mode-establishing-data storing portion which stores suitable-mode-establishing data representative of one of the different modes which is to be established during operation of the system by each operator; and (b-2) a suitable-mode establishing portion which establishes one of the different modes on the basis of the suitable-mode establishing data and according to the operator ID data inputted to the control device.