1. A caption display controlling method for displaying characters from extracted caption and text data encoded in a video composite signal on a video display screen comprising the steps of: discriminating one mode selected from (1) a caption mode, wherein characters from extracted caption data are displayed in a display region of the screen defined by a fixed number of video screen lines at a screen location determined from the extracted caption data; (2) a text mode, wherein characters from extracted text data are displayed over the entire video display screen; and (3) a scroll caption mode, wherein characters from extracted caption data are displayed in a display region of the screen defined by a variable number of screen lines, said characters being displayed including characters associated with the current video scene being displayed and previous displayed video scenes; decoding caption data encoded in an input composite video signal and displaying the characters decoded from said caption data in a predetermined portion of a screen when said caption mode is selected; decoding text data encoded in an input composite video signal and displaying the characters decoded from said text data on the overall screen when said text mode is selected; and decoding caption data and sequentially scrolling up and displaying the characters decoded from said caption data for a current scene together with captions for previous scenes on a display region of the screen defined by a variable number of video screen lines up to the overall number of video screen lines of the screen when the scroll caption mode is selected.
1. A caption display controlling method for displaying characters from extracted caption and text data encoded in a video composite signal on a video display screen comprising the steps of: discriminating one mode selected from (1) a caption mode, wherein characters from extracted caption data are displayed in a display region of the screen defined by a fixed number of video screen lines at a screen location determined from the extracted caption data; (2) a text mode, wherein characters from extracted text data are displayed over the entire video display screen; and (3) a scroll caption mode, wherein characters from extracted caption data are displayed in a display region of the screen defined by a variable number of screen lines, said characters being displayed including characters associated with the current video scene being displayed and previous displayed video scenes; decoding caption data encoded in an input composite video signal and displaying the characters decoded from said caption data in a predetermined portion of a screen when said caption mode is selected; decoding text data encoded in an input composite video signal and displaying the characters decoded from said text data on the overall screen when said text mode is selected; and decoding caption data and sequentially scrolling up and displaying the characters decoded from said caption data for a current scene together with captions for previous scenes on a display region of the screen defined by a variable number of video screen lines up to the overall number of video screen lines of the screen when the scroll caption mode is selected. 2. A caption display controlling method as claimed in claim 1, wherein said scrolling up displaying step includes a substep of selecting a position and a size of said on-screen displayed portion of the screen.