Communication device and communication system

A communication device for use in human body communication, said communication device comprising:

• a touch panel display;
• an electrode, in which the electrode is a transparent electrode that is superposed on a display plane of the touch panel display;
• a communication unit configured to process a communication signal that is transmitted/received by the electrode;
• and
• a control unit configured to control a communication operation depending on whether communication through a user and the electrode is stable or unstable,
• in which the touch panel display is configured to enable a count of a number of user's fingers that simultaneously touch the transparent electrode or perform an operation, and
• in which the control unit utilizes the number of counted fingers to decide whether the communication between the user and the electrode is stable or unstable such that when the number of counted fingers is equal to or smaller than a predetermined number the control unit decides the communication between the user and the electrode is unstable and when the number of counted fingers is larger than the predetermined number the control unit decides the communication between the user and the electrode is stable, in which the predetermined number is two so that the control unit decides the communication between the user and the electrode is unstable when the number of counted fingers is two or less and decides the communication between the user and the electrode is stable when the number of counted fingers is more than two.