A system for and a method of providing an integrated communications and broadcasting service are provided. This system includes a transmitter and a receiver. The transmitter converts a CATV broadcasting signal and a satellite broadcasting signal into a CATV broadcasting optical signal and a satellite broadcasting optical signal having predetermined wavelengths, wavelength-multiplexes the two broadcasting optical signals, and wavelength-multiplexes a wavelength-multiplexed broadcasting optical signal with an Internet data signal to transmit an integrated communications and broadcasting optical signal via a predetermined optical fiber. The receiver receives the integrated communications and broadcasting optical signal from the transmitter, demultiplexes the received signal according to a wavelength band, converts the CATV broadcasting optical signal, the satellite broadcasting optical signal, and the Internet data signal, into which the received signal is demultiplexed, into RF signals, and transports the RF signals to appropriate terminals.