Disclosed is a speech sound intelligibility evaluation system that identifies factors that contribute to unintelligibility and does not require cumbersome response input from a user. Said system is provided with: a speech sound presentation control unit that determines a speech sound to present by referring to a speech sound database that holds a plurality of speech sounds; an output unit that presents the determined speech sound to a user; a biosignal measurement unit that measures an EEG signal from the user; a positive-component determination unit that determines whether or not the EEG signal has any positive components in an event-related potential between 600 and 800 ms after the output unit has presented the aforementioned speech sound; a negative-component determination unit that determines whether or not the EEG signal has any negative components in an event-related potential between 100 and 300 ms after the output unit has presented the speech sound; and a speech sound intelligibility evaluation unit that uses the determination results on the presence or absence of positive and negative components to evaluate whether or not the presented speech sound was intelligible to the user.
SPEECH SOUND INTELLIGIBILITY EVALUATION SYSTEM, METHOD, AND PROGRAM