A signal from a tuner 22a is outputted to a primary display 2. An analog signal from a tuner 22b is digitally compressed, subjected to an encrypting process, transmitted to a secondary display 3 by a wireless LAN, and displayed by an LCD 46 of the secondary display 3. An output of a digital tuner 23 is displayed by the primary display 2. A video signal of 480I is transmitted to the secondary display 3. A signal inputted through the Internet is decoded and sent to the primary display 2. The signal is sent to the secondary display 3 as it is in the compressed state without being decoded and the decoding process is executed in the secondary display 3.