Provided is a waveform generating apparatus that generates analog signal based on fundamental waveform data including a predetermined number of samples, including: phase difference calculating section that calculates phase difference between the initial phase and final phase of a signal resulting from FSK-modulating, based on first set of modulation frequencies, input data sequence to be modulated onto a signal that the waveform generating apparatus generates; frequency calculating section that calculates correction frequency corresponding to quotient of dividing, by the predetermined number of samples, residue of dividing the phase difference by 2π; waveform producing section that produces fundamental waveform data representing a waveform corresponding to a signal resulting from FSK-modulating the input data sequence based on second set of modulation frequencies obtained by subtracting the correction frequency from the modulation frequencies in the first set; and output section that outputs a signal repeating the waveform represented by the fundamental waveform data.