An acoustic apparatus includes a positive value conversion section configured to convert, into a positive value, a response signal obtained by collecting a test signal emitted from a speaker using a microphone; a detection section configured to detect a first transient response part that becomes a first mountain portion of the converted response signal; an estimation section configured to estimate a rise point of the converted response signal from at least N points that contain a peak position of the first transient response part or the vicinity thereof; and a computation section configured to compute a time delay of audio collected by the microphone based on the estimated rise point and on a timing at which the test signal is generated.