A substrate-related-operation performing system improves its operation efficiency by preventing an error in replacing, for a substrate-related-operation performing apparatus thereof, an operation performing program with another operation performing program. A circuit-component mounting system includes a plurality of component mounting apparatuses are arranged in an array that perform cooperative operations to mount a plurality of circuit components on a substrate. One of the component mounting apparatuses implements a judging program, carrying out, in a judging mode, a judging operation when a mounting program is replaced with another mounting program, or when an operator inputs a command to carry out the judging operation. An operation-object code corresponding to a mounting program selected for a component mounting apparatus as a judgment-object operation performing apparatus is compared with a substrate code corresponding to the most downstream circuit substrate, whereby whether the mounting program is appropriate is judged.