The present invention relates to an online customer satisfaction survey and a system for providing a real-time customer satisfaction index, in which: a customer satisfaction survey is processed online, wherein the customer satisfaction survey is to survey composite sentiment-based satisfaction in survey target products or services, level-based satisfaction, and satisfaction in level-based attributes of the selected survey target products or services; a multiple regression analysis for the result of the customer satisfaction survey processed online is carried out in real time such that a calculated customer satisfaction index (CSI) is provided online in real time; and a customer satisfaction (CS) portfolio for finding fixed report forms(for example, graphs or diagrams that contains text or numbers) or points that need improvement and more competitive items is prepared and provided online in real time based on the calculated customer satisfaction index (CSI).
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