A video display system, comprising: a composer adapted to generate a video by overlaying graphics or by not overlaying graphics on a main video; a tone mapping processor adapted to perform a tone mapping process of converting a luminance of the generated video by using conversion characteristics according to a maximum luminance of the video; and a display adapted to display the video that has undergone the tone mapping process; characterized in that the composer is adapted to generate a first flag (graphics overlay flag) that indicates whether or not the graphics are overlaid on the main video; and the tone mapping processor is adapted (i) to switch, according to the first flag (graphics overlay flag) between (a) a first tone mapping process of dynamically changing the conversion characteristics according to a time-dependent change in the maximum luminance of the video and (b) a second tone mapping process that is performed using constant conversion characteristics irrespective of the change in the maximum luminance of the video; (ii) to perform the first tone mapping process when the first flag (graphics overlay flag) indicates that the graphics are not overlaid on the main video; and (iii) to perform the second tone mapping process when the first flag (graphics overlay flag) indicates that the graphics are overlaid on the main video. a composer adapted to generate a video by overlaying graphics or by not overlaying graphics on a main video; a tone mapping processor adapted to perform a tone mapping process of converting a luminance of the generated video by using conversion characteristics according to a maximum luminance of the video; and a display adapted to display the video that has undergone the tone mapping process; characterized in that the composer is adapted to generate a first flag (graphics overlay flag) that indicates whether or not the graphics are overlaid on the main video; and the tone mapping processor is adapted (i) to switch, according to the first flag (graphics overlay flag) between (a) a first tone mapping process of dynamically changing the conversion characteristics according to a time-dependent change in the maximum luminance of the video and (b) a second tone mapping process that is performed using constant conversion characteristics irrespective of the change in the maximum luminance of the video; (ii) to perform the first tone mapping process when the first flag (graphics overlay flag) indicates that the graphics are not overlaid on the main video; and (iii) to perform the second tone mapping process when the first flag (graphics overlay flag) indicates that the graphics are overlaid on the main video. (i) to switch, according to the first flag (graphics overlay flag) between (a) a first tone mapping process of dynamically changing the conversion characteristics according to a time-dependent change in the maximum luminance of the video and (b) a second tone mapping process that is performed using constant conversion characteristics irrespective of the change in the maximum luminance of the video; (ii) to perform the first tone mapping process when the first flag (graphics overlay flag) indicates that the graphics are not overlaid on the main video; and (iii) to perform the second tone mapping process when the first flag (graphics overlay flag) indicates that the graphics are overlaid on the main video.