A propagation delay time correction apparatus configured to adjust a propagation delay time of respective channels of an audio signal by performing a time alignment process to suppress sound image localization bias by Haas effect, comprising: a propagation delay time setting means comprising an interface configured to receive propagation delay time setting operations from a user so that the user can set, for a listening position of a listener, a propagation delay time for each of a plurality of predetermined frequency bands; a phase control amount calculation means configured to calculate respective phase control amounts for each of the plurality of predetermined frequency bands on a basis of the propagation delay time set for each of the plurality of predetermined frequency bands; and an audio signal generating means configured to perform the time alignment process by generating an audio signal on which a propagation delay correction is performed so that sound image localization bias by Haas effect is suppressed at the listening position of the listener; characterised in that: the propagation delay time correction apparatus comprises: a frequency spectrum signal generating means configured to generate a frequency spectrum signal by performing short-term Fourier transform on an audio signal, wherein the phase control amount calculation means is configured to calculate the respective phase control amounts for the frequency spectrum in the frequency domain for each of the plurality of predetermined frequency bands; a phase control signal generating means configured to smooth the calculated respective phase control amounts between the plurality of predetermined frequency bands so as to generate a phase control signal in which steep phase changes between frequency bands are smoothed; and a phase control means configured to control a phase of the frequency spectrum signal in the frequency domain for each of the plurality of predetermined frequency bands on a basis of the generated phase control signal; wherein: the audio signal generating means is configured to generate the audio signal by performing inverse short-term Fourier transform on the frequency spectrum signal of which the phase is controlled for each of the plurality of predetermined frequency bands. a propagation delay time setting means comprising an interface configured to receive propagation delay time setting operations from a user so that the user can set, for a listening position of a listener, a propagation delay time for each of a plurality of predetermined frequency bands; a phase control amount calculation means configured to calculate respective phase control amounts for each of the plurality of predetermined frequency bands on a basis of the propagation delay time set for each of the plurality of predetermined frequency bands; and an audio signal generating means configured to perform the time alignment process by generating an audio signal on which a propagation delay correction is performed so that sound image localization bias by Haas effect is suppressed at the listening position of the listener; characterised in that: the propagation delay time correction apparatus comprises: a frequency spectrum signal generating means configured to generate a frequency spectrum signal by performing short-term Fourier transform on an audio signal, wherein the phase control amount calculation means is configured to calculate the respective phase control amounts for the frequency spectrum in the frequency domain for each of the plurality of predetermined frequency bands; a phase control signal generating means configured to smooth the calculated respective phase control amounts between the plurality of predetermined frequency bands so as to generate a phase control signal in which steep phase changes between frequency bands are smoothed; and a phase control means configured to control a phase of the frequency spectrum signal in the frequency domain for each of the plurality of predetermined frequency bands on a basis of the generated phase control signal; wherein: the audio signal generating means is configured to generate the audio signal by performing inverse short-term Fourier transform on the frequency spectrum signal of which the phase is controlled for each of the plurality of predetermined frequency bands. a frequency spectrum signal generating means configured to generate a frequency spectrum signal by performing short-term Fourier transform on an audio signal, wherein the phase control amount calculation means is configured to calculate the respective phase control amounts for the frequency spectrum in the frequency domain for each of the plurality of predetermined frequency bands; a phase control signal generating means configured to smooth the calculated respective phase control amounts between the plurality of predetermined frequency bands so as to generate a phase control signal in which steep phase changes between frequency bands are smoothed; and a phase control means configured to control a phase of the frequency spectrum signal in the frequency domain for each of the plurality of predetermined frequency bands on a basis of the generated phase control signal; wherein: the audio signal generating means is configured to generate the audio signal by performing inverse short-term Fourier transform on the frequency spectrum signal of which the phase is controlled for each of the plurality of predetermined frequency bands.