A data processing system capable of optimizing multiple antennas, comprising: a display device equipped with a display panel, at least one internal antenna, and a display connector, wherein the display connector is electrically connected to the display panel and the at least one internal antenna; a proximity sensor electrically connected to the display connector and configured to detect whether an object is located close to the proximity sensor; a wireless data processing apparatus equipped with a data processing circuit, a wireless communication module, and an apparatus connector, wherein the data processing circuit and the wireless communication module are electrically connected to the apparatus connector, and the wireless communication module is electrically connected to the data processing circuit; and at least one external antenna, directly or indirectly electrically connected to the wireless communication module, wherein the at least one external antenna is located outside the display device; wherein the apparatus connector is configured to be connected to the display connector to connect the data processing circuit to the display panel, connect the proximity sensor to the data processing circuit, and connect the at least one internal antenna to the wireless communication module, and the data processing circuit is configured to output a display signal to the display panel; and wherein the data processing circuit controls the wireless communication module to set signal transmission strengths of the at least one internal antenna and the at least one external antenna by using a first antenna control mode, when the proximity sensor detects that the object is located close to the proximity sensor, the data processing circuit controls the wireless communication module to set the signal transmission strengths of the at least one internal antenna and the at least one external antenna by using a second antenna control mode, and the second antenna control mode comprises at least decreasing the signal transmission strength of the at least one internal antenna; characterized in that the proximity sensor comprises a video camera and a human face analysis module, the video camera is configured to continuously capture a detected image, the human face analysis module is configured to receive the detected image and continuously analyze the detected image to determine whether a human face exists in the detected image and whether a ratio of an area of the human face to an area of the detected image exceeds a threshold ratio, and when the human face exists in the detected image and the ratio exceeds the threshold ratio, the data processing circuit determines that the proximity sensor detects that the object is located close to the proximity sensor. a display device equipped with a display panel, at least one internal antenna, and a display connector, wherein the display connector is electrically connected to the display panel and the at least one internal antenna; a proximity sensor electrically connected to the display connector and configured to detect whether an object is located close to the proximity sensor; a wireless data processing apparatus equipped with a data processing circuit, a wireless communication module, and an apparatus connector, wherein the data processing circuit and the wireless communication module are electrically connected to the apparatus connector, and the wireless communication module is electrically connected to the data processing circuit; and at least one external antenna, directly or indirectly electrically connected to the wireless communication module, wherein the at least one external antenna is located outside the display device; wherein the apparatus connector is configured to be connected to the display connector to connect the data processing circuit to the display panel, connect the proximity sensor to the data processing circuit, and connect the at least one internal antenna to the wireless communication module, and the data processing circuit is configured to output a display signal to the display panel; and wherein the data processing circuit controls the wireless communication module to set signal transmission strengths of the at least one internal antenna and the at least one external antenna by using a first antenna control mode, when the proximity sensor detects that the object is located close to the proximity sensor, the data processing circuit controls the wireless communication module to set the signal transmission strengths of the at least one internal antenna and the at least one external antenna by using a second antenna control mode, and the second antenna control mode comprises at least decreasing the signal transmission strength of the at least one internal antenna; characterized in that the proximity sensor comprises a video camera and a human face analysis module, the video camera is configured to continuously capture a detected image, the human face analysis module is configured to receive the detected image and continuously analyze the detected image to determine whether a human face exists in the detected image and whether a ratio of an area of the human face to an area of the detected image exceeds a threshold ratio, and when the human face exists in the detected image and the ratio exceeds the threshold ratio, the data processing circuit determines that the proximity sensor detects that the object is located close to the proximity sensor.