and identified user a from it the displaying unit 12 shows the frame a corresponding to user a and the frame a displays the last page of the electronic book file which is the one that user a read it on the electronic reader 10 last time i e the last page of reading last time so that user a can rapidly continue to read the electronic book file the time and energy will be saved for searching the last page of last reading moreover the frame a also displays respective the page or the last page of various electronic books user a previously read on the electronic reader 10 in order to make user a choices at least one of the electronic books and then read it besides the frame a also can be a video frame of an animation file a digital photograph a menu frame an office work frame the frame of user a using last time or a combination thereof even if the recognition unit 11 has received the input and further identified the input belonging to user b then the displaying unit 12 shows the frame b corresponding to user b and the frame b is the last page which was read by user b on the electronic reader 10 last time so that user b can rapidly continue to read from where last reading similarly the frame b also can be respective the last page of various electronic books which user b previously read on the electronic reader 10 or the same as the frame a the frame b shows a video frame of an animation file a digital photograph a menu frame an office work frame the frame of user b using last time or a combination thereof it needs to be.