This paper describes practical solutions for constructing a ubiquitous network in building and home control systems. A hybrid network, which consists of a low power ad-hoc wireless network and a power/pipe line communication network with high frequency band dispersed-tone method, is developed. We have constructed appliance control systems by utilizing the proposed hybrid network system and have installed them in an actual building and home to evaluate their reliability and capability. High reliability and capability of the network system have been confirmed through the field test.