Abstract: A datum displaying method applied to a smart television can utilize a camera and a microphone of the smart television to capture image and acoustic features for identification and comparison, or utilize an NFC module of the smart television to directly acquire identification information of the user, so as to determine whether the user passes the identification. If yes, the user can log in the smart television, and therefore, the smart television provide a convenient identification function. Furthermore, after the identification information of the login user is confirmed, the smart television can automatically display a corresponding personal user interface and then unlock the program with classified constraint according to authorization information of the login user, and therefore, the smart television provide a function of smoothly watching the program with the classified constraint.