An audio signal supply apparatus which can broaden a listening area in the directions of directivity axes of acoustic beams output from a speaker array and directions other than the directions of the directivity axes. A listening area is set, propagation paths to be followed by sounds output from speakers constituting the speaker array until the sounds reach the listening area are identified, propagation path information related to the propagation paths is obtained, window function information giving wide directivities covering the entire listening area to the sounds output from the speakers is identified based on the propagation path information and the listening area size, and weighting on the signal levels of audio signals to be supplied to the speakers is carried out using the window function information.