An information processing device includes: a signal receiving portion that receives a signal in which input data that contains first and second bit values different from one another is encoded such that the first bit value is expressed by first amplitude values and the second bit value is expressed by second amplitude values different from the first amplitude values, and such that the same amplitude value does not occur twice in succession and the polarities of the amplitude values are inverted with each cycle; a clock signal extraction portion that extracts a clock signal by detecting polarity inversions in the received signal; a clock signal subtraction portion that subtracts the extracted clock signal from the received signal; and an input data decoding portion that decodes the input data by determining the first and second bit values based on an amplitude value of the signal obtained by subtracting the clock signal.