To enable safe control of network equipment, and thereby to enable to perform equipment control in closed network from intranet or the Internet.

In this system, one or more apparatuses for control 11 which have unique IP addresses and HTTP demand function, which acquire service information from an object equipment using UPnP retrieval method, and which provides operation using the service information; and one or more network devices 12, 13 which have unique IP addresses and HTTP server function, and which notify the state change to the apparatus for control 11 when the state is changed by the demand from apparatus for control 11 are connected to a network 14. The feature point is that the encryption processing is given respectively to some parts of the information transmitted from the network devices 12, 13 to the apparatuses 11 and to some parts of the information transmitted from the apparatuses for control 11 to the network devices 12, 13.