The present invention discloses a home network system which can achieve communication between a home master device and a remote control server by using a predetermined message structure. The home network system includes a home master device connected to a plurality of home appliances, and a remote control server connected to the home master device through a first network, for transmitting/receiving a message between a user terminal and the home master device. The message transmitted/received between the home master device and the remote control server includes at least a product code unit of the corresponding home appliance, a message code unit for notifying a transmission/reception direction of the message, parameter units under the definition of the message, and a number unit of parameters.