Disclosed is a method for controlling a door lock of a home network system, the method including: generating release information in an external software module which communicates with a first smart terminal, or in a software installed in the first smart terminal; transmitting the release information from the external software module or the first smart terminal to a second smart terminal which is independent from and not connected to the local network system at the time when receiving the release information; and locking or unlocking the door lock based on comparison of information input into the door lock from an outside of the door lock with the generated release information.