The present invention relates to an E-reader system using image feedback, which detects concentration of an attendee on the basis of a photographed image in real time and also stores image and sound content obtained by photographing lecture content, and then provides the image and sound content for a client requesting the same. The system can increase learning efficiency of the attendee by providing lecture-related marking information marked by the client during the lecture so that the attendee can read not only the lecture image simply but also content marked by himself or herself together with the image. Therefore, the system can provide a user(attendee and instructor)-oriented service, not a lecture content-oriented E-reader service.;COPYRIGHT KIPO 2014
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