A data transmission system and a visual interface apparatus are disclosed in the invention. The visual interface apparatus works with the operation apparatus and includes a control module and an interface module configured with a display function. The interface module includes a driving unit and a display panel. The control module transmits a display data and a transmission data to the driving unit and, after receiving and processing, the driving unit transmits a screen data and a coupling data to the display panel. When the operation apparatus operates on the visual interface apparatus, at least a part of the coupling data is coupled to the operation apparatus from the display panel. The invention is capable of processing the data for display and the data for transmission and then sending them to the display panel of the visual interface apparatus. Thus, the visual interface apparatus in the invention can be used to display images and also transmit the data such as data or file to another electronic apparatu
