A system comprising an electronic device and an external device, the electronic device comprising: a flexible display; and a processor (210, 420) configured to: control, in response to detection of a first user input, the flexible display to divide a display area into a first area and a second area; control the flexible display to display a first graphic element related to a first application in the first area, wherein the first graphic element includes an image corresponding to a video call conducted with the external device; control the flexible display to display a second graphic element in the second area, wherein the second graphic element corresponds to a graphical interface corresponding to a second application; characterized in that the processor (210, 420) is further configured to: control, in response to detecting a handwriting input related to the second graphic element, the first application to transmit the handwriting input and information corresponding to the second graphic element to the external device; receive, from the external device, a handwriting input related to the second graphic element; and control the flexible display to display the received handwriting input on the second graphic element in response to receiving the handwriting input. a flexible display; and a processor (210, 420) configured to: control, in response to detection of a first user input, the flexible display to divide a display area into a first area and a second area; control the flexible display to display a first graphic element related to a first application in the first area, wherein the first graphic element includes an image corresponding to a video call conducted with the external device; control the flexible display to display a second graphic element in the second area, wherein the second graphic element corresponds to a graphical interface corresponding to a second application; characterized in that the processor (210, 420) is further configured to: control, in response to detecting a handwriting input related to the second graphic element, the first application to transmit the handwriting input and information corresponding to the second graphic element to the external device; receive, from the external device, a handwriting input related to the second graphic element; and control the flexible display to display the received handwriting input on the second graphic element in response to receiving the handwriting input. control, in response to detection of a first user input, the flexible display to divide a display area into a first area and a second area; control the flexible display to display a first graphic element related to a first application in the first area, wherein the first graphic element includes an image corresponding to a video call conducted with the external device; control the flexible display to display a second graphic element in the second area, wherein the second graphic element corresponds to a graphical interface corresponding to a second application; characterized in that the processor (210, 420) is further configured to: control, in response to detecting a handwriting input related to the second graphic element, the first application to transmit the handwriting input and information corresponding to the second graphic element to the external device; receive, from the external device, a handwriting input related to the second graphic element; and control the flexible display to display the received handwriting input on the second graphic element in response to receiving the handwriting input. control, in response to detecting a handwriting input related to the second graphic element, the first application to transmit the handwriting input and information corresponding to the second graphic element to the external device; receive, from the external device, a handwriting input related to the second graphic element; and control the flexible display to display the received handwriting input on the second graphic element in response to receiving the handwriting input.