Operation of the image processing system 10 illustrated in FIG. 1 will be briefly described. The camera 101 images a state of the presenter 201 giving presentation while adding the description 203 to the description field 202, and thereby obtains moving image data. The moving image data is supplied to the image processing apparatus 102.

The image processing apparatus 102 processes the moving image data from the camera 101 and determines a description portion, and generates display data for displaying each of portions determined to be the description portion, as a description, and superimposes the display data over the moving image data. Subsequently, the moving image data (encoded image data) over which display data has been superimposed is distributed from the image processing apparatus 102 to the display devices 103-1 to 103-N through a wireless or wired network.

The display devices 103-1 to 103-N perform image display on the basis of the moving image data received from the image processing apparatus 102. In this case, the image displayed on the display is superimposed display in which description is superimposed and displayed over the image based on the moving image data.

Next, operation of the image processing apparatus 102 illustrated in FIG. 3 will be briefly described. Moving image data captured by the camera 101 is input to the image data input unit 122. The moving image data is supplied to the superimposition unit 125 and the description determination processing unit 123.