A transmitting apparatus, a transmitting method, a receiving apparatus, a receiving method, a program, and a content distribution system capable of stably supplying content to a plurality of terminal devices. A terminal device can receive content streaming distribution from a content distribution server over the Internet. In addition, the terminal device can relay the received content to a different terminal device over the Internet. If the quality of the content distributed in such a manner is degraded (e.g., the amount of delay increases), the content distribution server can control a TV broadcasting apparatus to streaming-distribute the content by on-air broadcast. In addition, the content distribution server can stop broadcasting of the content in accordance with the number of viewers.