The present invention relates to an electronic book library that can maximize the promotional effect in connection with paper books. To this end, the present invention, the electronic book storing the electronic book; A domain unit generating a subdomain matching the e-book; A recognition code unit for generating a recognition code including the subdomain information; And a control unit for controlling the e-book unit, the domain unit, and the identification code unit, and the control unit reads the sub-domain included in the corresponding recognition code when the book information including the identification code is received from the terminal. And transmitting the data to the terminal, wherein the e-book data includes a distribution module for transmitting at least one selected contact to the control unit, wherein the control unit transmits the identification code or subdomain to the contact transmitted by the distribution module. Provides a library of electronic books. Therefore, according to the present invention, it is possible to maximize the promotional effect by linking the paper book and the electronic book, there is an advantage that many people distribute the content.
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