A component mounting system includes an automatic loading-type tape feeder (a component supply unit) being capable of supplying up to N (N is a natural number equal to or larger than 1) carrier tapes for storing a component, and automatically transporting an inserted carrier tape, and a component mounting apparatus which mounts the component supplied from the tape feeder on a substrate, in which a replenishing operation of carrier tape with respect to the tape feeder is detected, and a case where a carrier tape with which the tape feeder is to be replenished is an (N+1)-th is notified to an operator.