Content that is simultaneously viewed by users of remotely located communication apparatuses is recorded along with images and sound corresponding to the users, for a synthesized reproduction. Synthesis information including parameters relating to setting a synthesis situation of an image and sound of the content and an image and sound of the users, along with information representative of a standard time, is produced and stored. The content being played back is recorded with the standard time added thereto. Similarly, real-time recording of the users includes the standard time. The synthesis information is produced again and stored when a parameter relating to setting the synthesis situation is changed.