A delay time calculation apparatus comprising: a setting unit configured to set sound receiving points (RP-i) within a target area, the sound receiving points (RP-i) being target arrival points within the target area for acoustic waves output from speaker units (2110-i) of a speaker array, and the target area being a target emission region for acoustic waves output from speaker units (2110-i) of the speaker array; a user interface providing unit configured to accept input positions of the speaker units (2110-i) and input positions of the sound receiving points (RP-i); and a delay time calculation unit configured to calculate delay times for the speaker units (2110-i) from when an input audio signal is received by said delay time calculation unit to when the input audio signal is supplied to the speaker units (2110-i), said delay time calculation unit being configured to determine for each of the speaker units (2110-i) an average value of differences between distances between the sound receiving points (RP-i) for the speaker units (2110-i), with reference to which the delay calculation is implemented, and other speaker units (2110-j) of the speaker array other than said each of the speaker units (2110-i), and distances between the sound receiving points (RP-i) for the speaker units (2110-i) and the speaker units (2110-i), determine for said each of the speaker units (2110-i) an average value of differences between distances from the other speaker units (2110-j) to sound receiving points for the other speaker units (2110-j) and distances from the speaker units (2110-i) to the sound receiving points for the other speaker units (2110-j), and convert an average of both the average values for said each of the speaker units (2110-i) into the delay time for said each of the speaker units (2110-i). a setting unit configured to set sound receiving points (RP-i) within a target area, the sound receiving points (RP-i) being target arrival points within the target area for acoustic waves output from speaker units (2110-i) of a speaker array, and the target area being a target emission region for acoustic waves output from speaker units (2110-i) of the speaker array; a user interface providing unit configured to accept input positions of the speaker units (2110-i) and input positions of the sound receiving points (RP-i); and a delay time calculation unit configured to calculate delay times for the speaker units (2110-i) from when an input audio signal is received by said delay time calculation unit to when the input audio signal is supplied to the speaker units (2110-i), said delay time calculation unit being configured to determine for each of the speaker units (2110-i) an average value of differences between distances between the sound receiving points (RP-i) for the speaker units (2110-i), with reference to which the delay calculation is implemented, and other speaker units (2110-j) of the speaker array other than said each of the speaker units (2110-i), and distances between the sound receiving points (RP-i) for the speaker units (2110-i) and the speaker units (2110-i), determine for said each of the speaker units (2110-i) an average value of differences between distances from the other speaker units (2110-j) to sound receiving points for the other speaker units (2110-j) and distances from the speaker units (2110-i) to the sound receiving points for the other speaker units (2110-j), and convert an average of both the average values for said each of the speaker units (2110-i) into the delay time for said each of the speaker units (2110-i).