An information processing apparatus includes a calculation unit configured to calculate distance spectra based on a beat signal being a difference between a transmitted wave, which is a radio wave that is transmitted by a sensor and that is swept in frequency, and a reflected wave of the transmitted wave, the reflected wave being received by the sensor, and configured to calculate one or more time-sequenced waveforms each indicating time changes in intensity of the distance spectra with respect to respective distances from the sensor, and a detection unit configured to detect respiration of a living organism based on the one or more time-sequenced waveforms.