A radio frequency receiver using an auto gain controller, and a radio frequency receiving method. The radio frequency receiving method includes receiving and attenuating a radio frequency signal including one or more inband signals of at least one channel and an inter-band signal between the inband signals according to a predetermined attenuation degree, amplifying an output signal, and measuring a signal-to-noise ratio of the inband signal of a desired channel of the output signal where the inter-band signal adjacent to the desired channel is a representative of an inband noise and controlling the attenuation degree so that the measured signal-to-noise ratio is maintained higher than a previous signal-to-noise ratio.