An interaction interface device for providing an interface between a touch display unit and an external device. The touch display unit comprising a display unit having a touch surface. The interaction interface device comprises a first interface between the interaction interface device and the touch display unit, the first interface being configured to: receive a first touch data from the touch display unit, wherein the first touch data corresponds to touch interactions occurring within a sub-portion of the display unit, and transmit a first video data to the touch display unit for display on the sub-portion of the display unit, a second interface between the interaction interface device and the external device, the second interface being configured to: receive the first video data from an external device, and transmit the first touch data to the external device.