The present invention relates to an inaudible sound wave based door lock management server, door lock device, door opening and closing authentication method and application. In accordance with another embodiment of the present invention, an inaudible sound wave-based door opening and closing authentication method includes: a step in which an application for door lock authentication transmits a phone number to a door lock management server (S200); And according to the user's door opening request input, the door lock authentication application generates authentication key data including the phone number and time data at the time of the output request, and outputs an audible sound wave corresponding to the authentication key data. Step (S400); includes.
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