An electronic device comprising: a memory; a display unit; a wireless communication unit configured to communicate with a first external electronic device (10c_1) and a second external electronic device (10c_2): an interface unit configured to connect the first external electronic device (10c_1) to the electronic device, wherein the interface unit includes a High Definition Multimedia Interface, HDMI, standard interface or a Universal Serial Bus, USB, standard interface to connect the first external electronic device (10c_2) to the electronic device; and a controller configured to; share a display area of the display unit with a first screen of the first external electronic device (10c_1) and a second screen of the second external electronic device (10c_2) received through the wireless communication unit, wherein the display area shared with the first screen is a first shared screen and the display area shared with the second screen is a second shared screen, cause the display unit to display a current item execution screen, and the first and second shared screens (M1, M2), wherein the first and second shared screens (M1, M2) in-clude images respectively mirroring the screens of the first and second external electronic devices (10c_1, 10c_2), capture an entire screen displayed on the display unit and generate a captured image when a screen capture signal is received, transmit the captured image to the first external electronic device (10c 1) through the interface unit, wherein the first external electronic device (10c_1) is configured to display the captured image and to store the captured image, produce animation effects including that the captured image is absorbed into the first shared screen and a display area of the captured image in the display unit is gradually reduced and finally located in the first shared screen, and transmit a control signal for controlling the first external electronic device (10c 1) to generate a predetermined alarm sound. a memory; a display unit; a wireless communication unit configured to communicate with a first external electronic device (10c_1) and a second external electronic device (10c_2): an interface unit configured to connect the first external electronic device (10c_1) to the electronic device, wherein the interface unit includes a High Definition Multimedia Interface, HDMI, standard interface or a Universal Serial Bus, USB, standard interface to connect the first external electronic device (10c_2) to the electronic device; and a controller configured to; share a display area of the display unit with a first screen of the first external electronic device (10c_1) and a second screen of the second external electronic device (10c_2) received through the wireless communication unit, wherein the display area shared with the first screen is a first shared screen and the display area shared with the second screen is a second shared screen, cause the display unit to display a current item execution screen, and the first and second shared screens (M1, M2), wherein the first and second shared screens (M1, M2) in-clude images respectively mirroring the screens of the first and second external electronic devices (10c_1, 10c_2), capture an entire screen displayed on the display unit and generate a captured image when a screen capture signal is received, transmit the captured image to the first external electronic device (10c 1) through the interface unit, wherein the first external electronic device (10c_1) is configured to display the captured image and to store the captured image, produce animation effects including that the captured image is absorbed into the first shared screen and a display area of the captured image in the display unit is gradually reduced and finally located in the first shared screen, and transmit a control signal for controlling the first external electronic device (10c 1) to generate a predetermined alarm sound.