A method for displaying an information window and a display apparatus thereof are provided. A display apparatus includes a network interface which receives time-varying information from an external source, an On Screen Display (OSD) generating unit which generates an information window to show the information, a signal processing unit which processes an image signal to be ready to display, a display unit which displays the processed image with the generated information window on a screen, and a control unit which controls the OSD generating unit, the signal processing unit, and the display unit for the processed image and the generated information window are displayed together.