To facilitate the right protection of content data in streaming.
A data management part 231 accepts a content providing request from a user terminal. When the content is of paid content data, the management part confirms whether the user terminal is licensed for the content or not to a license server, reads silent data from a silent database 243, when not licensed, reads audio data from an audio database 242, and outputs them to a selection control part 243. The selection control part 234 converts the audio data supplied from the data management part 231 to silent audio data and outputs it to an audio packeting part 233. The audio packeting part 233 converts the audio data converted by the selection control part 234 to a format suitable to data transmission, and transmits it to the user terminal through a communication part 99.
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