An RF system integrated with an RF switching unit and an RF modulator unit. In accordance with the present invention, it is provided the RF system including a plurality of antenna, an RF unit and a digital tuner and demodulator unit, includes a plurality of RF input terminals connected with the respective antenna; an RF relay for selectively outputting RF signal inputted to the plurality of RF input terminals on the basis of control signal; an RF amplifier for amplifying RF signal outputted from the RF relay; an RF signal distributor for distributing RF signal amplified and outputted from the RF amplifier; an RF modulator for receiving and modulating signal outputted from the digital tuner and demodulator unit connected with the RF signal distributor to output RF signal; an RF selection switch for selectively outputting at least one of RF signal outputted from the RF signal distributor and RF signal outputted from the RF modulator on the basis of control signal; and an RF output terminal for outputting signal from the RF selection switch.