According to one embodiment, a detector configured to detect an operator of a remote control for remote-controlling a video display apparatus is provided. The detector includes a face detector, a remote control detector, and an operator identifier. The face detector is configured to detect a first position of a viewer's face from a taken video. The remote control detector is configured to detect a second position of the remote control from the taken video. The operator identifier is configured to identify a viewer operating the remote control based on the detected first position of the viewer's face and the detected second position of the remote control when a plurality of viewer's faces are detected.