Apparatus and method for controlling display of electronic book device

PURPOSE: A display controlling device of electronic book device is provided to improve a page switching speed responding to a page up/down by outputting a object page data from the buffer memory when the page switching signal is received from the power saving mode. CONSTITUTION: A main processor(104) outputs the page data of the contents stored in the main memory on display mode and transfers to the display controller. The page switching signal is received in power saving mode, a sub processor(108) transfers the page switching control command to the display controller. A buffer memory(112) stores the page which is adjacent to the current page. The display controller outputs the target page data from the buffer memory and displays to the electronic paper panel.