Abstract: An apparatus for monitoring a tire pressure using a radio frequency identification system wherein a pressure and a temperature of a tire is constantly monitored for a driver to predict a dangerous situation that may occur in a future and to take a prompt action on the predicted dangerous situation is disclosed. The apparatus comprises a tag for measuring a pressure and a temperature of a tire installed on each of wheels, a reader for providing a power to the tag and for receiving and processing a pressure and temperature information provided by the reader, and a display device for receiving the processed pressure and temperature information and displaying the received pressure and temperature information.