A terminal comprising: a display unit for displaying a current image, wherein a current image is an image currently displayed on the display, an information collection unit configured to acquire subsidiary information added to a current image by a user and collect authentication information relating to the user according to an information hiding command received for the current image, wherein the subsidiary information comprises annotation information visible on the current image; an information processing unit configured to execute the following steps: preventing the subsidiary information from being displayed on the current image, and embedding the subsidiary information and the authentication information into a file of the current image from which the displaying of subsidiary information is prevented in a related manner; or eliminating a display identifier of the subsidiary information from the current image, and embedding the subsidiary information, the display identifier, and the authentication information into the file of the current image from which the display identifier is eliminated from in a related manner, wherein the annotation information comprises any one or more of: a character, a text, a graphic, a website link, and the display identifier of the subsidiary information, where the subsidiary information includes any of an audio file, a video file, an image file, a document, and an application. a display unit for displaying a current image, wherein a current image is an image currently displayed on the display, an information collection unit configured to acquire subsidiary information added to a current image by a user and collect authentication information relating to the user according to an information hiding command received for the current image, wherein the subsidiary information comprises annotation information visible on the current image; an information processing unit configured to execute the following steps: preventing the subsidiary information from being displayed on the current image, and embedding the subsidiary information and the authentication information into a file of the current image from which the displaying of subsidiary information is prevented in a related manner; or eliminating a display identifier of the subsidiary information from the current image, and embedding the subsidiary information, the display identifier, and the authentication information into the file of the current image from which the display identifier is eliminated from in a related manner, preventing the subsidiary information from being displayed on the current image, and embedding the subsidiary information and the authentication information into a file of the current image from which the displaying of subsidiary information is prevented in a related manner; or eliminating a display identifier of the subsidiary information from the current image, and embedding the subsidiary information, the display identifier, and the authentication information into the file of the current image from which the display identifier is eliminated from in a related manner, wherein the annotation information comprises any one or more of: a character, a text, a graphic, a website link, and the display identifier of the subsidiary information, where the subsidiary information includes any of an audio file, a video file, an image file, a document, and an application. a character, a text, a graphic, a website link, and the display identifier of the subsidiary information, where the subsidiary information includes any of an audio file, a video file, an image file, a document, and an application. <EOS>