Disclosed in the present invention are an image mark data processing and restoring system, an image mark data processing method and apparatus, and an image mark data restoring method and apparatus. A gray scale image is superposed on an image, information marking is performed on the gray scale image, then the gray scale image carrying an information mark collapses into binary data, and the binary data is transmitted to other data terminal; other data terminal receives the binary data, restores the binary data into a gray scale image having mark information, then superposes the gray scale image with the original image, and outputs the image carrying the mark information, so as to implement rapid transmission of image mark information of different data terminals; the image mark information is converted into the binary data for transmission, the transmission quantity of the binary data is small, the transmission speed is high, and the problem of transmission delay of the image mark information between different data terminals in the prior art can be solved; and when the volume of the transmitted image mark information is large, the present technical solutions can effectively reduce the data transmission delay and improve the transmission timeliness of the image mark information between different data terminals.