Herein provided is a control system capable of efficiently and assuredly performing
a remote-control of a plurality of instruments. When the plurality of instruments,
which are connected to a network 600 and controllable by a computer, namely
a first camera 300 and a second camera 400 as shown in FIG. 1,
are remotely and simultaneously controlled, the present system is constituted so
that a control right of the second camera 400 acquired by a certain client
enables the client to control even the first camera while disenables other clients
except for the client which acquires the control right to control both the first
camera 300 and second camera 400. Accordingly, it turns unnecessary
to individually acquire all of the control rights to control the related instruments,
first camera 300 and the second camera 400.