A display device, comprising: a display unit configured to simultaneously display a plurality of different content within a plurality of regions of the display unit; and a control unit configured to: - receive a selection of a plurality of source devices, - separately allocate a specific button (F1-F4), of a plurality of buttons at a remote control device, to each source device of the selected plurality of source devices, such that each of the selected source devices is associated with a different allocated button (F1-F4) of the remote control device, - control the display unit to simultaneously display, within each separate region of the plurality of regions, content from a specific corresponding one of the source devices and an icon (F1_ICON-F4_ICON) associated with one of the specific buttons (F1-F4) allocated to the specific corresponding one of the source devices, wherein each one of the separate regions of the display unit is associated with a different one of the sources devices, and each of the specific icons (F1_ICON-F4_ICON) is displayed in a respective region based on the specific corresponding source device associated with the corresponding region, - receive, from the remote control device, a control activation request for a first source device of the plurality of source devices via the allocated button for the first source device, in response to receiving the control activation request, activate control of the first source device, and control the display unit to display a control activation icon (RC_ICON), indicating that control of the first source device is activated, within the region (410, 430) corresponding to the first source device while simultaneously displaying, within the region (410, 430) corresponding to the first source device, the content from the first source device and the icon (F1_ICON) associated with the specific button allocated to the first source device, and control an operation of the first source device in response to a signal received from the remote control device. a display unit configured to simultaneously display a plurality of different content within a plurality of regions of the display unit; and a control unit configured to: - receive a selection of a plurality of source devices, - separately allocate a specific button (F1-F4), of a plurality of buttons at a remote control device, to each source device of the selected plurality of source devices, such that each of the selected source devices is associated with a different allocated button (F1-F4) of the remote control device, - control the display unit to simultaneously display, within each separate region of the plurality of regions, content from a specific corresponding one of the source devices and an icon (F1_ICON-F4_ICON) associated with one of the specific buttons (F1-F4) allocated to the specific corresponding one of the source devices, wherein each one of the separate regions of the display unit is associated with a different one of the sources devices, and each of the specific icons (F1_ICON-F4_ICON) is displayed in a respective region based on the specific corresponding source device associated with the corresponding region, - receive, from the remote control device, a control activation request for a first source device of the plurality of source devices via the allocated button for the first source device, - receive a selection of a plurality of source devices, - separately allocate a specific button (F1-F4), of a plurality of buttons at a remote control device, to each source device of the selected plurality of source devices, such that each of the selected source devices is associated with a different allocated button (F1-F4) of the remote control device, - control the display unit to simultaneously display, within each separate region of the plurality of regions, content from a specific corresponding one of the source devices and an icon (F1_ICON-F4_ICON) associated with one of the specific buttons (F1-F4) allocated to the specific corresponding one of the source devices, wherein each one of the separate regions of the display unit is associated with a different one of the sources devices, and each of the specific icons (F1_ICON-F4_ICON) is displayed in a respective region based on the specific corresponding source device associated with the corresponding region, - receive, from the remote control device, a control activation request for a first source device of the plurality of source devices via the allocated button for the first source device, in response to receiving the control activation request, activate control of the first source device, and control the display unit to display a control activation icon (RC_ICON), indicating that control of the first source device is activated, within the region (410, 430) corresponding to the first source device while simultaneously displaying, within the region (410, 430) corresponding to the first source device, the content from the first source device and the icon (F1_ICON) associated with the specific button allocated to the first source device, and control an operation of the first source device in response to a signal received from the remote control device.