Assignment function notifying means (24) of a shelf management unit (2) notifies assignment function accepting means (35) of a board management unit (3a), what function executing right is assigned. Subsequently, execution function selecting means (34) of the board management unit (3a) selects a function to be actually executed, from the functions which can be executed in the board. After the shelf management unit (2) notified the function be assigned, the information be used in the function to be assigned is notified from using information notifying means (26) to using information accepting means (37) of a second device. After this, function executing means (38) of the board management unit (3a) executes the function assigned.