An information processing method for an information processing system (1) according to the present disclosure includes a processed sound generation step and an adjustment step. In the processed sound generation step, the processed sound is generated by acoustic processing using a parameter that changes a sound collection function or a hearing aid function of a sound output unit. In the adjustment step, the sound output unit is adjusted by a parameter selected on the basis of a parameter used for the acoustic processing and feedback on the processed sound output from the sound output unit.