To provide a customer service support system, a customer service support device and a customer service support method capable of supporting a store clerk based on a comprehension degree of a customer who is in service. SOLUTION: The customer support system for supporting the clerk 2 corresponding to the customer 1 is provided with an information acquisition device 10 for acquiring images, a facial expression of the customer from an image acquired by the information acquisition device, and based on the facial expression And an evaluation device for outputting an evaluation result evaluating the understanding degree of the customer. BACKGROUND OF THE INVENTION【課題】接客中の顧客の理解度に基づいて店員を支援することができる接客支援システム、接客支援装置及び接客支援方法を提供する。【解決手段】顧客1に対応する係員2を支援する接客支援システムを、画像を取得する情報取得装置10と、情報取得装置が取得した画像から顧客の表情を認識して、該表情に基づいて顧客の理解度を評価した評価結果を出力する評価装置とによって構成する。【選択図】図1