A method for confirming connection state of a home appliance in home network system is disclosed, which includes a step in which the home appliance periodically confirms the connection state to the home network system, a step in which the appliance generates a packet for requiring address allocation, a step in which the appliance transfers the packet to network managing appliance, a step in which the allocating the address of the appliance from the network managing appliance, and a step in which the appliance transfers the alive notifying packet to the network managing appliance.