Physical random number generator, method of generating physical random numbers and physical random number storing medium

A physical random number generator, including a noise source for generating a noise signal, an AC coupling amplifying unit for amplifying the noise signal while removing DC component therefrom by AC coupling to generate an amplified noise signal, and an A/D conversion unit for A/D converting the amplified noise signal to digital values and for generating random number data based on the digital values as an output of the physical random number generator.