SYSTÈME DE TRAITEMENT D'INFORMATIONS, SERVEUR DE TRAITEMENT D'INFORMATIONS, PROGRAMME DE TRAITEMENT D'INFORMATIONS ET PROCÉDÉ D'ÉVALUATION DE LA FATIGUE
An information processing system obtains sensor information that includes information related to heart beat and/or pulse of a user, from a sensor which senses biological information of the user in a state where the sensor is not in contact with the user. The sensor is, for example, a Doppler sensor. The information processing system calculates an index indicating a degree of fatigue of the user, based on the sensor information. The index may be calculated by a system on a terminal side, or may be calculated by a system on a server side. The information processing system presents, to the user, information related to the index.