The present invention provides an originating user with a prioritized list of communication contacts associated with the various communication devices of a destination user, wherein the originating user will initiate communications with the destination user using one of the communication contacts provided in the prioritized list. In this process, a single recording pulse waveform is recorded on a single track of the optical recording medium for three or more times, and sampled values zp,1,. Therefore, it is possible to adjust the transmitted bits according to size of the channel quality indicator information. Information of a shared load that needs to be shared is transmitted to the selected sharing base station. The guard ring is separated from an insulating interlayer film including a topmost interconnect.