Door lock, device for controlling door lock, program for controlling door lock and server f or managing door lock

A door lock comprising:

• a door lock body installed on a door and having an opening/closing device for opening and closing the door;
• a memory embedded in the door lock body to store a door lock identifier including a door recognition code assigned to the door and a door lock ID matched with the door recognition code;
• an antenna provided in the door lock body to sequentially receive a first RF signal and a second RF signal from a reader;
• and
• a control unit configured to transmit the door recognition code to the reader through the antenna such that the door recognition code together with a reader recognition code previously assigned to the reader is authenticated by a door lock management server that is communicatively connected with the reader when receiving the first RF signal, and configured to determine whether the door lock ID provided from the door lock management server through the reader matches the previously assigned door lock ID of the door lock identifier when receiving the second RF signal to control the opening/closing device such that the door is maintained in a lock state or released from the lock state,
• wherein authentication to the door recognition code is determined according to an authentication result of the reader recognition code by the door lock management server.