To solve the problem of leading to no benefits for information sponsors because commercial messages are skipped or fast forwarded, when information temporarily recorded by a recording and reproducing device is reproduced.

Scramble information of video/audio information such as a movie which follows a commercial signal, is placed dispersedly in the commercial signal. In the case of reproduction, a user will no longer be able to interpret scrambled information and view/listen to the video/audio information without reproducing almost all commercial messages. The scrambled information is changed, each time commercial messages are transmitted.