A portable electronic device comprising: a display ; a memory ; a sensor configured to detect insertion or removal of a stylus pen ; and at least one processor configured to, when the portable electronic device is in an unlocked state: display, on the display , a screen of a first application while the stylus pen is inserted, detect, using the sensor , removal of the stylus pen while the screen of the first application is displayed, when the removal of the stylus pen is detected: execute a second application in response to the removal of the stylus pen , and identify information, stored in the memory , including a previously generated handwritten memo associated with the second application acquired before detection of the removal of the stylus pen , and display, on the display , a screen of the second application including the previously generated handwritten memo, and when the insertion of the stylus pen is detected: terminate display of the screen of the second application; and display, on the display , the screen of the first application or a screen of a default page . a display ; a memory ; a sensor configured to detect insertion or removal of a stylus pen ; and at least one processor configured to, when the portable electronic device is in an unlocked state: display, on the display , a screen of a first application while the stylus pen is inserted, detect, using the sensor , removal of the stylus pen while the screen of the first application is displayed, when the removal of the stylus pen is detected: execute a second application in response to the removal of the stylus pen , and identify information, stored in the memory , including a previously generated handwritten memo associated with the second application acquired before detection of the removal of the stylus pen , and display, on the display , a screen of the second application including the previously generated handwritten memo, and when the insertion of the stylus pen is detected: terminate display of the screen of the second application; and display, on the display , the screen of the first application or a screen of a default page . display, on the display , a screen of a first application while the stylus pen is inserted, detect, using the sensor , removal of the stylus pen while the screen of the first application is displayed, when the removal of the stylus pen is detected: execute a second application in response to the removal of the stylus pen , and identify information, stored in the memory , including a previously generated handwritten memo associated with the second application acquired before detection of the removal of the stylus pen , and display, on the display , a screen of the second application including the previously generated handwritten memo, and when the insertion of the stylus pen is detected: terminate display of the screen of the second application; and display, on the display , the screen of the first application or a screen of a default page . execute a second application in response to the removal of the stylus pen , and identify information, stored in the memory , including a previously generated handwritten memo associated with the second application acquired before detection of the removal of the stylus pen , and display, on the display , a screen of the second application including the previously generated handwritten memo, and when the insertion of the stylus pen is detected: terminate display of the screen of the second application; and display, on the display , the screen of the first application or a screen of a default page . terminate display of the screen of the second application; and display, on the display , the screen of the first application or a screen of a default page . <EOS>