Recently, the number of IoT devices has increased, and this trend has been extended to home appliances (e.g. air conditioners, washing machines, refrigerators, etc.) and equipment (e.g. storage batteries, photovoltaics, etc.). There are mainly two architectures regarding to IoT conversion of the appliances installed in these houses. Specifically, they are "IoT devices connect to a server on the Internet via a controller" and "IoT devices connect to a server on the Internet directly". In this paper, these architectures are compared and it is shown that what kind of usage each architecture is effective.