Disclosed is a media gateway device that has plural call control means for performing call control between the Internet and a public network and plural interconnection means for performing line connection and media conversion of user data between the Internet and the public network and interconnects the Internet and the public network, wherein the media gateway device sets specific call control means for performing line connection control of the plural interconnection means and includes plural call control means other than the specific call control means, the plural call control units requesting the specific call control means to perform line connection control of the plural interconnection means, the specific call control means has management data storage means for storing management data for determining which one of the plural interconnection means controls which line of the public network, and each of the plural call control means other than the specific call control means has control request means for requesting the specific call control means to perform the line connection control of the plural interconnection means.
