A TCP communication scheme which ensures safe communication up to the communication path near a terminal and eliminates direct attacks from hackers, etc. An SDO couples all acquired samples of a waveform being monitored to all of its processing boards. In the optical connector, a ferrule assemble having a polygonal prism-shaped flange is accommodated and held so as to elastically reciprocate in a housing of a cavity which has a polygonal engaging portion to receive and engage the flange of the ferrule assemble. The detection element detects the control object value supplied to the transfer element. Further, some embodiments may correct or remove corrupted data retrospectively. Some types of financial transactions may be guaranteed, such as by real world financial devices including credit cards.