A device for advertising a study book is provided to smoothly output A/V information for the study book in a bookstore and protect a main frame case by using a simple structure. The main frame case(10) has a rectangular parallelepiped shape. An LCD(Liquid Crystal Display)(20) is exposed at a front side of the main frame case and displays the video information related to the study book to the outside. A speaker(30) is installed to the front side of the main frame case and outputs the audio information related to the study book provided through the LCD to the outside. A power-on/off switch(40) is exposed to one side of the main frame case and turns on/off power supplied to the LCD and the speaker from the outside. An external case(50) has one opened side for inserting the main frame case into the inside and forms a display hole(51) to a part corresponding to the LCD to expose the LCD. The external case includes a printing display part(52) printed to an external side to have the same shape as a cover of the study book.
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