A home network system and a method for operating the same. The home network system includes a bridge capable of performing the conversion of communication standards of messages communicated between networks having different communication standards. The home network system includes a control network connected to a plurality of home appliances based on different communication standards for every production company, a UPnP (Universal Plug and Play) network connected to a plurality of home appliances based on an UPnP communication standard, and a bridge for composing/listening to a message communicated between the control network and the UPnP network so that it carries out mutual-communication standard conversion. Therefore, the home network system increases compatibility so that different network devices connected to the same network can be interoperable with each other, resulting in increased reliability of an overall network system.