1. An apparatus for reporting an operation state of digital rights management (DRM) of a control device to a control point in a home network formed with the at least one control device and the control point, the apparatus comprising: a processor; a DRM module which performs DRM; a state variable generation unit which receives DRM operation state information indicating the state of a DRM process currently operating, from the DRM module, and generates DRM state variables based on the received DRM state information; and a universal plug and play (uPnP) module which, by using a uPnP protocol, transmits the state variables generated by the state variable generation unit to the control point, wherein if the DRM state information indicates that authentication by the DRM module is successful, the state variable generation unit causes an authenticating state variable, which indicates that an authentication operation by the DRM module is performed, to change to a normal-operation state variable which indicates that the DRM module is normally operating, and if the DRM state information indicates that the authentication by the DRM module has failed, the state variable generation unit causes the authenticating state variable to change to an authentication-failed state variable which indicates that a result of the authentication by the DRM module is a failure.