A beam switching antenna system and method and apparatus for controlling the same is provided, by which optimal antenna characteristics can be maintained according to a peripheral environment, the necessary time and power consumption of searching an optimal beam-direction can be reduced, and electromagnetic waves of a beam generated from an antenna can be minimized. The circuit board has a power ground node and a conditional conducting path, and is set inside the conducting casing. The call may include a circuit-switched component and a packet-switched component. A step is formed around the perimeter of the surface of the mold resin, and the semiconductor package and the lens member are joined by fitting the step and a projection of a lens holder. At least one of the network-linked devices is provided with a storage region tofrom which data can be writtenread out by any other device on the network upon transmission of a predetermined command, so that data can be transmitted throughout the network by using the storage region. The spring is set apart from the bimetal conductor.