To easily realize scrupious education and training, utilization of video, understanding of education and training contents from low order to high order, and inter-attendants information exchange.

A server device 5 of a supplemental information service entrepreneur controls and monitors transmission and reception of the questions and answers mailed between the terminals of attendants 4 and the terminal of an instructor 20, and also stores the information on the questions and answers useful for a knowledge database 15, the supplemental information or the like for supplementing the education and training. When reproducing the contents 3 of the education and training recorded in a recording medium, the attendant terminals 4 display a picture for making access to the accompanying information. The attendant terminals 4 make access to the server device 5 of the accompanying information service entrepreneur via the Internet 2 by a prescribed operation to the above picture, and obtains the accompanying information from the knowledge database 15 to visually and audibly display it to the attendants.