Abstract: Music data is easily and positively produced from a melody the user imagined to himself/herself, without the need of musical expertise. Accepted are an input of a melody voice the user is singing to himself/herself and a key depression corresponding to a rhythm of the melody voice to be inputted. Depending upon a timing of the accepted key depression, voice pitch and note value are extracted from the melody voice. The produced music data is format-changed into a file for outputting at a terminal unit, and then sent toward the terminal unit.

Abstract: An information announcing server (1) converts information (6) provided by an information provider (2) into an information program (10) and transmits this information program (10) to an information terminal (5a). The information terminal (5a) transmits the information program (10) to an information terminal (5b) of a user who can not access the information announcing server when not using the information program (10). The information terminal (5b) transmits the information program (10) to a still another information terminal (5c). The information terminal (5c) uses the information contained in the information program (10) and, as a consequence, the information program (10) itself notifies the information announcing server (1) of the “state of use of the information” and a “transfer route list” through a network server (4).