A transmission management apparatus for managing a session performing transmission/reception of content data via a relay apparatus , the transmission management apparatus comprising: a service information management unit configured to manage service management information in which service identification information identifying service content provided to each of a plurality of transmission terminals , and service content corresponding to the service identification information are stored preliminarily, wherein the service content is information comprising quality items for indicating qualities of the content data; a service identification information acquisition unit configured to acquire service identification information of each of the transmission terminals participating in the session; a service content determination unit configured to determine the service content of the session, based on the service identification information acquired by the service identification information acquisition unit and the service management information; and a session control unit configured to report session information based on the service content of the session determined by the service content determination unit to the relay apparatus , wherein the session information includes information specifying the qualities of content data which the relay apparatus transfers to each of the transmission terminals participating in the session, the service information management unit is configured to manage service priority information in which the service identification information is stored in association with information related to a selection of the quality of the content data for each of the quality items of the service content in a case there are options for the quality of the content data stored in a quality item of the service content, and the service content determination unit is configured to determine the quality of the content data based on the service priority information from qualities of content data that the plurality of transmission terminals commonly use. a service information management unit configured to manage service management information in which service identification information identifying service content provided to each of a plurality of transmission terminals , and service content corresponding to the service identification information are stored preliminarily, wherein the service content is information comprising quality items for indicating qualities of the content data; a service identification information acquisition unit configured to acquire service identification information of each of the transmission terminals participating in the session; a service content determination unit configured to determine the service content of the session, based on the service identification information acquired by the service identification information acquisition unit and the service management information; and a session control unit configured to report session information based on the service content of the session determined by the service content determination unit to the relay apparatus , wherein the session information includes information specifying the qualities of content data which the relay apparatus transfers to each of the transmission terminals participating in the session, the service information management unit is configured to manage service priority information in which the service identification information is stored in association with information related to a selection of the quality of the content data for each of the quality items of the service content in a case there are options for the quality of the content data stored in a quality item of the service content, and the service content determination unit is configured to determine the quality of the content data based on the service priority information from qualities of content data that the plurality of transmission terminals commonly use. <EOS>