An audio signal processing method executed by an audio signal processing device includes: obtaining an audio signal having an attribute indicating an indirect sound; calculating a first sound volume based on a sound volume of the indirect sound when arriving at a listening position, using: a first correction characteristic obtained by correcting, using a frequency characteristic indicating auditory sensitivity, a gain characteristic of each predetermined frequency bandwidth related to the indirect sound; and the audio signal; calculating a second sound volume based on a sound volume of a direct sound, associated with the indirect sound, when arriving at the listening position; selecting whether to output an output signal based on the audio signal, using: a sound volume ratio between the second and first sound volumes; and a time difference between the direct and indirect sounds; and outputting the output signal, when outputting the output signal is selected.