Abstract: In this paper, we propose two gateway architectures. The first one is the home gateway, which interconnects the home networks and the public (access) network. We show its requirements and software design. We implemented an experimental home gateway base of the Web server enhanced with Java facilities. It interconnects the Internet and the home networks (IEEE1394 AV network and the ECHONET home automation network). It also has a real-time MPEG4 transcoding function which transcodes AV data on IEEE1394 in to MPEG4 video. It provides the capability of remote control of the home, and the AV data transmission/translation capabilities. The second one is the wireless gateway. We show the background respecting the wireless gateway and its design. The key issue is to develop interconnectivity between wired and wireless networks. Then we show out implementation of it. It interconnects IEEE1394 and 802.11b 2.4GHz band high-speed wireless network, and transmits AV control commands and high-quality AV data.