A system for displaying video contents each including video data including a plurality of non-overlapping video segments and their corresponding concomitant data associated with the video data, the system comprising: content display mode determining means (21,41,51,61,71,81) for adaptively determining, per video segment, a display mode which is indicative of how video data and corresponding concomitant data included in a video content to be displayed are arranged on a display screen in such a manner that the display mode is adapted to content of said video segment and content of said corresponding concomitant data; and content arranging means (223,723,923) for generating, per video segment, a video content in which said video data and said concomitant data are arranged according to the display mode determined by said content display mode determining means, such that the video content generated by said content arranging means is displayed on the display screen, wherein the content display mode determining means is adapted to divide the display screen into a video display area and a concomitant data display area in such a manner that the dividing pattern is determined per video segment of said video content, said content display mode determining means is further adapted to determine the display mode for the video content to be displayed by using a predetermined evaluation function for calculating an evaluated value for each display mode depending on the displayed video content made up of video data displayed in said video display area and concomitant data displayed in said concomitant data display area so as to determine a mode of dividing the display screen into said video display area and said concomitant data area that provides an optimized evaluated value of displayed video content, said predetermined evaluation function using at least one of evaluation criteria: (i) amount of information provided to user, (ii) value of information, and (iii) ease with which to see information, and said content display mode determining means is further adapted to: determine, per video segment, the evaluated value of the video content to be displayed, using a first evaluation function for evaluating the video data displayed in said video display area, a second evaluation function for evaluating the concomitant data displayed in the concomitant data display area, and a third evaluation function representing a balance of importance between the video data and the concomitant data corresponding to the video data; and determine a mode of dividing the display screen for each video segment in order to optimize the determined evaluated value. content display mode determining means (21,41,51,61,71,81) for adaptively determining, per video segment, a display mode which is indicative of how video data and corresponding concomitant data included in a video content to be displayed are arranged on a display screen in such a manner that the display mode is adapted to content of said video segment and content of said corresponding concomitant data; and content arranging means (223,723,923) for generating, per video segment, a video content in which said video data and said concomitant data are arranged according to the display mode determined by said content display mode determining means, such that the video content generated by said content arranging means is displayed on the display screen, wherein the content display mode determining means is adapted to divide the display screen into a video display area and a concomitant data display area in such a manner that the dividing pattern is determined per video segment of said video content, said content display mode determining means is further adapted to determine the display mode for the video content to be displayed by using a predetermined evaluation function for calculating an evaluated value for each display mode depending on the displayed video content made up of video data displayed in said video display area and concomitant data displayed in said concomitant data display area so as to determine a mode of dividing the display screen into said video display area and said concomitant data area that provides an optimized evaluated value of displayed video content, said predetermined evaluation function using at least one of evaluation criteria: (i) amount of information provided to user, (ii) value of information, and (iii) ease with which to see information, and said content display mode determining means is further adapted to: determine, per video segment, the evaluated value of the video content to be displayed, using a first evaluation function for evaluating the video data displayed in said video display area, a second evaluation function for evaluating the concomitant data displayed in the concomitant data display area, and a third evaluation function representing a balance of importance between the video data and the concomitant data corresponding to the video data; and determine a mode of dividing the display screen for each video segment in order to optimize the determined evaluated value. determine, per video segment, the evaluated value of the video content to be displayed, using a first evaluation function for evaluating the video data displayed in said video display area, a second evaluation function for evaluating the concomitant data displayed in the concomitant data display area, and a third evaluation function representing a balance of importance between the video data and the concomitant data corresponding to the video data; and determine a mode of dividing the display screen for each video segment in order to optimize the determined evaluated value.