An acoustic signal processing apparatus includes a processor and a memory. The processor executes: detecting an acoustic signal that is contained in a sound input signal and that is generated by a human body calculating an effective volume indicating an effective volume of the acoustic signal detected at the detecting the acoustic signal, based on the input signal calculating an accumulated effective volume by accumulating effective volumes calculated at the calculating the effective volume and determining whether the accumulated effective volume calculated at the calculating the accumulated effective volume has reached a predetermined threshold.
