Breathing detection device and breathing detection method

The disclosed breathing detection device and breathing detection method take advantage of the characteristic that the sound of breathing has low autocorrelation and high cross-correlation to determine whether or not the sound of breathing is contained in the current frame. Specifically, a harmonic structure estimation unit (130) calculates the autocorrelation on the basis of the frequency spectrum of the current frame. A cross-correlation estimation unit (140) calculates the cross-correlation between the frequency spectrum of the current frame and the frequency spectrum of a past frame that contained the sound of breathing. A breathing detection unit (150) compares the autocorrelation value multiplied by a constant with the cross-correlation value and determines that the sound of breathing is contained in the current frame if the cross-correlation value is greater.