Disclosed are a display device and a method for operating the same. According to an embodiment of the present disclosure, a display device includes a display, a tuner including a first demodulator and a plurality of RF ICs which receive a signal through a tuned channel, and a processor including a second demodulator and configured to lock a channel through each demodulator according to a tuning request, process a signal demodulated through a demodulator selected based on a threshold sensitivity value for signal detection individually set in the each demodulator, and control a video to be output through the display.