Abstract: A display apparatus with a processor is configured to: store data of a first operating system (OS), a second OS and a third OS in a first area, a second area and a third area of a memory, respectively, and restrict access of the first OS to the data stored in the second area and access of the first OS and the second OS to the data stored in the third area; receive content from an external apparatus based on execution of the first OS, and receive authentication information of the content from the external apparatus based on execution of the second OS; and authenticate the content based on the received authentication information based on execution of the third OS, and control the content to be processed.

Abstract: An information providing system including a content providing apparatus, a display apparatus, and a terminal apparatus is provided. The information providing system includes: a content providing apparatus to generate a watermark, insert the watermark into a predetermined location of a content on a real time basis, and transmit the content; a display apparatus to receive the content into which the watermark is inserted and output the content; and a terminal apparatus to receive input of at least one of an image and sound of the content comprising the watermark from the display apparatus, detect the watermark, extract identification information from the watermark, and output corresponding additional information. Accordingly, information is provided to a user by inserting and extracting the watermark in various methods.

Abstract: Disclosed are a cyber trading service apparatus and method. A CPU displays a sell order screen when a user logs into a cyber trading system. The CPU receives stock price information on a holding item from a securities server and displays the information on a quotation information window when the user selects a holding item button on the sell order screen. The CPU calculates a stock price and a profit and loss list corresponding to the stock price, and displays them on a profit and loss list window when the user selects the profit and loss item of the profit and loss list. A profit and loss analysis value is displayed using the selected stock price as a sell price when the user selects a specific quotation on the profit and loss list window. A sell order is transmitted to the securities server when an order transmission button is selected.