A reception method comprising: receiving a plurality of frames transferring content, the frames containing reference clock information, wherein for each frame the frame contain a plurality of second transfer units, each of the second transfer units contains one or more first transfer units, each of the first transfer units contains one or more Internet Protocol, IP, packets, the reference clock information is contained in the first transfer unit positioned first within the frame; the reference clock information is stored at a position that is offset by a fixed length from a header of the first transfer unit positioned first within the frame; an identifier, indicating that a first transfer unit contains the reference clock information, is stored in a header of the second transfer unit that contains the first transfer unit, among the plurality of second transfer units; the reception method further comprising: extracting the reference clock information directly from the IP packet of the received frames by extracting the reference clock information from the position that is offset by the fixed length from the header of the first transfer unit positioned first within the frame; and generating a clock used for reproduction of the content that uses the one or more IP packets by using the extracted reference clock information. receiving a plurality of frames transferring content, the frames containing reference clock information, wherein for each frame the frame contain a plurality of second transfer units, each of the second transfer units contains one or more first transfer units, each of the first transfer units contains one or more Internet Protocol, IP, packets, the reference clock information is contained in the first transfer unit positioned first within the frame; the reference clock information is stored at a position that is offset by a fixed length from a header of the first transfer unit positioned first within the frame; an identifier, indicating that a first transfer unit contains the reference clock information, is stored in a header of the second transfer unit that contains the first transfer unit, among the plurality of second transfer units; the frame contain a plurality of second transfer units, each of the second transfer units contains one or more first transfer units, each of the first transfer units contains one or more Internet Protocol, IP, packets, the reference clock information is contained in the first transfer unit positioned first within the frame; the reference clock information is stored at a position that is offset by a fixed length from a header of the first transfer unit positioned first within the frame; an identifier, indicating that a first transfer unit contains the reference clock information, is stored in a header of the second transfer unit that contains the first transfer unit, among the plurality of second transfer units; the reception method further comprising: extracting the reference clock information directly from the IP packet of the received frames by extracting the reference clock information from the position that is offset by the fixed length from the header of the first transfer unit positioned first within the frame; and generating a clock used for reproduction of the content that uses the one or more IP packets by using the extracted reference clock information. extracting the reference clock information directly from the IP packet of the received frames by extracting the reference clock information from the position that is offset by the fixed length from the header of the first transfer unit positioned first within the frame; and generating a clock used for reproduction of the content that uses the one or more IP packets by using the extracted reference clock information.