Provided are low-power wireless communication apparatuses and a method thereof. The pixel detecting element includes: a pixel electrode for receiving charges, a storage capacitor for storing the received charges, and a thin film transistor for controlling outputting of the stored charges. If the adhesive strength is made high, then the adhesion between the adhesive ingredients is increased, thus forming a film that is difficult to cut. Before the connection between the calling terminal and the requesting terminal has been established, data which determine the calling terminal are sent to the other terminal or at least to one of the other terminals of user group.