A kind of smart phone the present invention relates to service book searching using LED and for executing this method, these are suggested to intuitively showing location information, not only quantity spends in the supplementary means that the specific registered room library of specific position uses LED as light emitting source by Books Retrieve System, shortening. The method that user can easily find the specific book of specific position is mounted on each book using illumination LED s, is received according to a control signal, and use smart phone application, to execute above. According to the present invention, after this method searches for the books of previously stored location information books display books,When receiving which user on the screen and wishing, book and smart mobile phone application to be searched are inputted, a LED is irradiated and is connected to corresponding book book management database is connected to by transmitter. ;The 2015 of copyright KIPO submissions
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