A communication terminal includes a first communication unit which has a power supply function by electromagnetic induction and writes or reads information in an active or passive mode, and a second communication unit having a communication capability higher than that of the first communication unit. The invention is characterized in that the shell base, following separation from the shell, can be divided into smaller parts which are harmless for the environment. A memory interface unit demultiplexes the multiplexed optical signals into the original optical signals and converts the demultiplexed optical signals into electrical signals.