Patent ID: 8120459

Claim:
An access authentication system for a home, comprising: a door phone; a door lock for detecting a visitor outside the door and releasing a lock when a door lock release command is received; a video phone for communicating with the visitor and for controlling the door lock, wherein the video phone is located inside the home; a smart communicator for configuring access approval levels of expected visitors and access authentication information for each access approval level, communicating with the visitor, and controlling the door lock; and a home network server for storing the access approval levels of expected visitors and access authentication information for each access approval level received from the smart communicator, checking the access approval level of the visitor attempting to release the door lock by comparing access authentication information of the visitor with previously stored access authentication information, and transmitting a door lock relief command to the door lock according to the access approval level of the visitor, determining whether a resident is located in the home when the door lock relief is approved, and monitoring the visitor when it is determined that the resident is not located in the home, wherein the home network server remotely communicates with the smart communicator, and transmits information on door lock release attempts to the smart communicator when the door lock release is attempted by the visitor and the smart communicator remotely establishes a communication channel with the door phone connected to the home network server.