In the present invention, a moving-picture editing program (12) controls the recording of the data transmitted from a personal computer (1-1), into a user video-data management database (4). The program (12) determines whether the data should be supplied to another personal computer (1-2) in response to a demand made by the personal computer (1-1). The moving-picture editing program (12) supplies the data to the other personal computer (1-2) in response to the demand from the other personal computer (1-2) when it is determined that the data should be supplied to the personal computer (1-1). Hence, the data can be utilized by many other users.