In the auditory event-related potential measuring system for evaluation is heard, it is possible to suppress the variation of the auditory event-related potential from a change in arousal level, in order to measure the auditory event-related potential to a high precision, and considered appropriate in addition to the auditory stimuli reducing the change in the arousal level of the user by presenting a picture size to be. Auditory event-related potentials measurement system, as versus viewing angle of the corner of the area in a video image is presented to the user has a smaller range than the big 14 degrees than twice the size to determine the size of the area in the video decision parts and, to a user, a video output unit for presenting the video image including a region of a size determined by the size determining unit, the auditory stimulus output unit for presenting the auditory stimulus to a user during a period in which the image is presented to the user When a biological signal measurement section for measuring an electroencephalogram signal of a user, starting from the time at which the auditory stimulus is presented, and a brain wave processing unit for acquiring an event-related potential from the electroencephalogram signal.聞こえ評価のための聴覚事象関連電位測定システムにおいて、覚醒度の変化に由来する聴覚事象関連電位の変動を抑制し、高精度に聴覚事象関連電位を計測するために、聴覚刺激以外に適切と考えられるサイズで映像を呈示してユーザの覚醒度の変化を低減する。聴覚事象関連電位計測システムは、ユーザに呈示される映像中の領域の対角の視角が2度よりも大きく14度よりも小さい範囲を有するように、映像中の領域のサイズを決定するサイズ決定部と、ユーザに、サイズ決定部で決定された大きさの領域を含む映像を呈示する映像出力部と、ユーザに映像が呈示されている期間中にユーザに聴覚刺激を呈示する聴覚刺激出力部と、ユーザの脳波信号を計測する生体信号計測部と、聴覚刺激が呈示された時刻を起点として、脳波信号から事象関連電位を取得する脳波処理部とを備えている。
