To eliminate the human input error of operation data and to stably operate a line conveyor based on a production plan by providing a communication network connecting conveyor control means and area control means.

An area sequencer 16 receives a hanger information based on conveyor control information such as device emptying command information or merger supporting information and transmits the hanger information to each panel controller 19. Each panel controller 19 processes branch or merge command information based on the hanger information and controls the operation of the conveyor of each process by the branch or merge command information. The panel controller 19 reads a branch destination from line conveyor operation information written in an ID tag via an ID system to automatically branch a hanger to a required conveyor.