A storage medium storing a fault monitoring program to cause a computer to carry out a fault monitoring method of a plurality of portable radio communication terminals in a commodity management system, each of which manages commodities by communicating with an inventory controller via a radio communication base station, said fault monitoring method comprising:
- a step of automatically executing a test of a radio communication section in an arbitrary portable radio communication terminals when a number of retrying times of radio communication between the arbitrary portable radio communication terminal and said radio communication base station exceeds a predetermined number of times;
- and
- a step of displaying a fault of said radio communication section on a display section of the arbitrary portable radio communication terminal when said fault occurs, and
- wherein a call time interval of retrying said radio communication between the arbitrary portable radio communication terminal and said radio communication base station is set longer than an average communication time of said radio communication between each of said portable radio communication terminals and said radio communication base station in said commodity management system.