A distribution control system that is connected to a plurality of communication terminals (5; 5a to 5f) including at least a first communication terminal (5e1) and a second communication terminal (5f1) that outputs image data and transmits the image data to the communication terminals (5; 5a to 5f), the distribution control system comprising: a browser management unit configured to start up a browser appropriate for the communication terminals (5; 5a to 5f); the browser configured to generate still image data by rendering content data; a transmitter configured to transmit video data to the communication terminals (5; 5a to 5f); a receiver configured to receive input information from the communication terminals (5; 5a to 5f); and an encoder configured to convert the still image data into the video data; wherein the transmitter is configured to transmit the video data into which the still image data updated by the browser in accordance with the input information has been converted, to the communication terminals (5; 5a to 5f); characterized in that: the receiver is further configured to receive input information from at least the first communication terminal and the second communication terminal (5f1), the input information including video streams (E1, E2) and gesture events generated using electronic pens (p1, p2) associated with respective ones of the first communication terminal (5e1) and the second communication terminal (5f1), the gesture events including coordinate information; the browser is further configured to render content data to produce still image data in the form of data frames by arranging the video streams included in the received input information (E1, E2) at positions within the data frames based on the coordinate information, and draw strokes on the data frames based on the gesture events; the encoder is further configured to encode the data frames having the strokes drawn thereon to produce video data in the form of a video stream; and the transmitter is further configured to transmit the produced video stream to the first communication terminal (5e1) and the second communication terminal (5f1). a browser management unit configured to start up a browser appropriate for the communication terminals (5; 5a to 5f); the browser configured to generate still image data by rendering content data; a transmitter configured to transmit video data to the communication terminals (5; 5a to 5f); a receiver configured to receive input information from the communication terminals (5; 5a to 5f); and an encoder configured to convert the still image data into the video data; wherein the transmitter is configured to transmit the video data into which the still image data updated by the browser in accordance with the input information has been converted, to the communication terminals (5; 5a to 5f); characterized in that: the receiver is further configured to receive input information from at least the first communication terminal and the second communication terminal (5f1), the input information including video streams (E1, E2) and gesture events generated using electronic pens (p1, p2) associated with respective ones of the first communication terminal (5e1) and the second communication terminal (5f1), the gesture events including coordinate information; the browser is further configured to render content data to produce still image data in the form of data frames by arranging the video streams included in the received input information (E1, E2) at positions within the data frames based on the coordinate information, and draw strokes on the data frames based on the gesture events; the encoder is further configured to encode the data frames having the strokes drawn thereon to produce video data in the form of a video stream; and the transmitter is further configured to transmit the produced video stream to the first communication terminal (5e1) and the second communication terminal (5f1). the receiver is further configured to receive input information from at least the first communication terminal and the second communication terminal (5f1), the input information including video streams (E1, E2) and gesture events generated using electronic pens (p1, p2) associated with respective ones of the first communication terminal (5e1) and the second communication terminal (5f1), the gesture events including coordinate information; the browser is further configured to render content data to produce still image data in the form of data frames by arranging the video streams included in the received input information (E1, E2) at positions within the data frames based on the coordinate information, and draw strokes on the data frames based on the gesture events; the encoder is further configured to encode the data frames having the strokes drawn thereon to produce video data in the form of a video stream; and the transmitter is further configured to transmit the produced video stream to the first communication terminal (5e1) and the second communication terminal (5f1).