unpleasant sound pressure estimation system (100) includes a plurality of periodic noise from EEG signal of the user occurs based on the interval between the time and the sound stimuli noise that was predicted from the time interval occurs, the measurement time of the event-related potential of the second sound, and the third sound, the time at which the next periodic noise is generated a predetermined noise As a post-duration sound stimulus scheduling unit that determines the time of outputting the sound stimulus group (90), it receives a time when sound stimulus set is outputted, in the electroencephalogram signal of the user that biological signal measurement section is measured , starting from the respective times of sound stimulus set is output, extracting a feature value of the event-related potential of the electroencephalogram signal event-related potentials feature amount extracting section (55) and extracted with event-related potentials feature extraction unit Based on the characteristic amount, and an unpleasant sound pressure determination unit for determining an unpleasant sound pressure with respect to the frequency of the acoustic stimulation group and (65).不快音圧推定システム(100)は、ユーザの脳波信号から複数の周期的ノイズが発生した時間間隔から予測したノイズが発生する時刻と音刺激の間隔とに基づいて、第2音及び第3音の事象関連電位の計測時間が、次の周期的ノイズが発生する時刻から所定のノイズ継続時間後となるように、音刺激群を出力する時刻を決定する音刺激スケジューリング部(90)と、音刺激群が出力される時刻を受け取り、生体信号計測部が計測したユーザの脳波信号において、音刺激群が出力されたそれぞれの時刻を起点とする、脳波信号の事象関連電位の特徴量を抽出する事象関連電位特徴量抽出部(55)と、事象関連電位特徴量抽出部で抽出した特徴量に基づいて、音刺激群の周波数に対する不快音圧を決定する不快音圧判定部(65)とを備える。
