In the present invention, a sound pressure level that a user finds uncomfortable (UCL) is objectively determined in a shorter amount of time. An uncomfortable sound pressure determination system comprises the following: a biometric signal measuring unit that measures the brain wave signals of a user a sound data generation unit that generates sound data relating to a plurality of sounds which increase or decrease in order from a first sound to an nth sound (n: an integer of at least 2), each sound being a pure tone of the same frequency an output unit that presents a plurality of sounds to a user on the basis of the sound data a characteristic amount extraction unit that extracts a characteristic amount relating to a time change of the frequency of an event-related potential on the basis of a brain wave signal event-related potential measured after a predetermined period of time has elapsed from the time when the plurality of sounds were presented and an uncomfortable sound pressure determination unit that refers to a pre-prepared correspondence relationship between the time change of the frequency of an event-related potential and an uncomfortable sound pressure and determines that a sound pressure corresponding to a characteristic amount extracted by the characteristic amount extraction unit is an uncomfortable sound pressure in the frequency.La présente invention porte sur un niveau de pression sonore quun utilisateur trouve inconfortable (UCL) qui est déterminé objectivement dans un laps de temps plus court. Un système de détermination de pression sonore inconfortable comprend les éléments suivants : une unité de mesure de signal biométrique qui mesure les signaux dondes cérébrales dun utilisateur, une unité de génération de données de son qui génère des données de son relatives à une pluralité de sons qui augmentent ou diminuent dans lordre dun premier son à un nième son (n : un nombre entier dau moins 2), chaque son étant un son de tonalité pure de la même fré
