PROBLEM TO BE SOLVED: To provide a system capable of performing electrical stimulation as intended without requiring the trouble of mounting electrodes at arrangement positions suitable for respective patients. SOLUTION: An electrode array 10 in which a plurality of electrodes for applying electrical stimulation to a living body are arranged, and electrode selection for selecting one electrode set from a plurality of electrode sets including a predetermined electrode among the plurality of electrodes Means 20, an electrical stimulation generator 21 for outputting electrical stimulation to a plurality of electrodes, a sensor 5 for detecting a reaction of a predetermined muscle by applying electrical stimulation to a living body, and an electrode selection means 20 for a plurality of electrode groups. Based on the detection unit 23 that acquires the detection information of the sensor 5 when the electrical stimulation is output to the selected electrode set and at least some of the electrode sets, and the detection information acquired by the acquisition unit 23 And an electrode determination unit 24 that determines a suitable electrode set from among the electrode sets. [Selection diagram] Fig. 5【課題】それぞれの患者に合った配置位置に電極を装着するという手間を要することなく、狙い通りの電気刺激を行うことが可能なシステムを提供する。【解決手段】生体に電気刺激を与えるための複数の電極が並べられた電極アレイ１０と、複数の電極のうち所定の電極を含む複数の電極組の中から１つの電極組を選択する電極選択手段２０と、複数の電極に電気刺激を出力する電気刺激発生部２１と、生体に電気刺激を与えることによって所定の筋の反応を検知するセンサ５と、電極選択手段２０によって複数の電極組のうち少なくとも一部の電極組を選択するとともに、選択した電極組に電気刺激を出力したときのセンサ５の検知情報を取得する取得部２３と、取得部２３が取得した検知情報に基づいて、複数の電極組の中から好適な電極組を決定する電極決定部２４と、を有する。【選択図】図５
