In ambient information society, a variety of networks consisting of sensory and computational devices are embedded in the environment and individuals. They are autonomously connected, merged, and divided depending on the context and provide a network service appropriate for time, place, occasion, and individuals. In this paper, we investigate how such dynamic network formation is performed focusing on synchronization of operational frequency. Assuming that a pulse-coupled oscillator model is adopted for autonomous and self-organizing synchronization, we show how networks operating on different operational frequency are connected, merged, and divided.