Apparatus and method for controling output window based emr system

The present invention relates to a method for controlling an output window based on an electronic medical record (EMR) system. The method comprises the steps of: relaying and displaying a plurality of windows to a preset size when a window size setting mode is executed to set a size by windows displayed on an EMR screen; activating a relevant window and enlarging the size of the window based on a variable range by stages for the output window, when user interrupt for any one of the displayed windows occurs; determining a position by controlling the size of each of the windows relayed on the EMR screen in response to the size of the window enlarged according to the variable range by stages; and creating a list of the relayed windows and displaying the list in a predetermined area, when a window different from the relayed windows is called in the window size setting mode, and displaying the called window to a preset size.