In order to enable, even when there exist a plurality of apparatuses configured to perform processing of an upper layer of the transport layer for one apparatus configured to perform processing of the transport layer or a lower layer, reliable communication with each of the apparatuses configured to perform the processing of the upper layer, via the transport layer, an apparatus includes a generating section 141 configured to generate a transport layer packet including identification information in a packet region different from a service data unit, the identification information being used in an upper layer of a transport layer, and a transmission processing section 143 configured to transmit the transport layer packet.