A component mounting system has a supply reel accommodating a component, a plurality of mounting lines each having a mounting apparatus and a line management apparatus, and a central network that provides direct communication between the line management apparatuses of each mounting line. A remaining number of components on the supply reel is determined based on cross line communication between the line management apparatuses and comparison of data at different times stored on the line management apparatuses. Such architecture does not require the use of a central server. Rather, the system is a material information exchange system without a single point of failure, where no one computer failure can cause an entire factory shutdown.