An apparatus for generating signal waveform for biological stimulation capable of generating and outputting a biological stimulation signal wave, from a signal existing in the external environment, reflected from the signal, which includes a signal input unit for inputting an external signal from the external environment and an output waveform generation unit for generating and outputting a first biological stimulation signal wave modulated with at least one of a frequency component, an envelope component and an amplitude component included in the external signal acquired by the signal input unit and/or synchronized with an output timing of the external signal.