An infusion set comprises a base member, an introducer cap, and an infusion cap. By doing so, even in case of transmitting a DTMF signal by way of a communication apparatus performing a voice code compression, it is made possible for a reception side communication apparatus to judgerecognize the DTMF signal without error. The graphical user interface may further include a zone size setting presenting selectable distance values enabling the user to set the distance between the site and the boundary of each zone.