A display device is disclosed. A display device according to an embodiment of the present specification includes a display unit configured to display visual information, a camera unit configured to capture an image in front of the display device, a sensor unit configured to sense user input applied to the display device, and a control unit configured to control the display device, wherein the control unit detects at least one user from the captured image, maintains display of the visual information and processes received user input when the detected user includes a predetermined master user, the control unit detects at least one user from the captured image, maintains display of the visual information and does not process the received user input when the detected user does not include the predetermined master user, and the control unit deactivates the display unit when no user is detected in the captured image.