Provided are a fatigue evaluation system and method which are objective and quantitative, and which can be applied easily in daily life. During a period in which a subject still remembers a predetermined task, a memory task corresponding to a non-matching condition and a matching condition is set, and then a fatigue index is calculated by using the brain activity signals and the reaction time associated with the two conditions. The fatigue index and/or an evaluation result obtained from the fatigue index are displayed.
FATIGUE EVALUATION SYSTEM