An electronic device comprising: a touch sensitive display; one or more processors; and a non-transitory computer readable storage medium storing one or more programs comprising instructions, which when executed by the electronic device with the touch sensitive display configured to sense user touch input, and the one or more processors, cause the electronic device to: display a first application execution screen as a pop-up window, wherein the pop-up window is displayed to be superposed on at least a portion of a second application execution screen displayed on the touch sensitive display; move a position of the pop-up window according to a touch input wherein the touch input comprises a touch and drag input on the pop-up window; display guide information on the touch sensitive display based on the pop-up window, moved according to the touch input, being at least partially disposed on a switching region, wherein the guide information notifies a position where a split window, changed from the pop-up window, is to be displayed; and change the pop-up window into the split window, based at least on the pop-up window moved to the switching region according to the touch input having stayed in the switching region for a predetermined length of time, wherein changing the pop-up window into the split window comprises displaying the first application execution screen and the second application execution screen as split windows on the touch sensitive display not to be superposed on one another. a touch sensitive display; one or more processors; and a non-transitory computer readable storage medium storing one or more programs comprising instructions, which when executed by the electronic device with the touch sensitive display configured to sense user touch input, and the one or more processors, cause the electronic device to: display a first application execution screen as a pop-up window, wherein the pop-up window is displayed to be superposed on at least a portion of a second application execution screen displayed on the touch sensitive display; move a position of the pop-up window according to a touch input wherein the touch input comprises a touch and drag input on the pop-up window; display guide information on the touch sensitive display based on the pop-up window, moved according to the touch input, being at least partially disposed on a switching region, wherein the guide information notifies a position where a split window, changed from the pop-up window, is to be displayed; and change the pop-up window into the split window, based at least on the pop-up window moved to the switching region according to the touch input having stayed in the switching region for a predetermined length of time, wherein changing the pop-up window into the split window comprises displaying the first application execution screen and the second application execution screen as split windows on the touch sensitive display not to be superposed on one another. display a first application execution screen as a pop-up window, wherein the pop-up window is displayed to be superposed on at least a portion of a second application execution screen displayed on the touch sensitive display; move a position of the pop-up window according to a touch input wherein the touch input comprises a touch and drag input on the pop-up window; display guide information on the touch sensitive display based on the pop-up window, moved according to the touch input, being at least partially disposed on a switching region, wherein the guide information notifies a position where a split window, changed from the pop-up window, is to be displayed; and change the pop-up window into the split window, based at least on the pop-up window moved to the switching region according to the touch input having stayed in the switching region for a predetermined length of time, wherein changing the pop-up window into the split window comprises displaying the first application execution screen and the second application execution screen as split windows on the touch sensitive display not to be superposed on one another.