According to another exemplary embodiment of the present disclosure, a method for monitoring a pressure in a biliary tract includes: receiving a measured value of a pressure in a biliary tract from a stent for a biliary tract having a pressure sensor mounted therein, by a subcutaneous implant medical device; collecting the measured value of the pressure at a predetermined cycle and transmitting collected information to an external device, by the subcutaneous implant medical device; and analyzing the collected information to expect a timing of biliary obstruction, and providing expected information to the patient, by the external device.