PURPOSE: To provide the remote management system with a high management efficiency by reducing a job time of a person in charge.

CONSTITUTION: An input/output data request means provided to a central processing unit 3 of a management company 1 sends a transmission request via an I/F 3d, a line control/data transmitter-receiver 4 and a public line 5 to monitor an I/O port of a microcomputer 8a provided to a dryer 8. An input/ output data transmission means provided to the microcomputer 8a of the dryer 8 arranged in a laundry shop 2 sends data relating to an I/O port based on a received transmission request. The central processing unit 3 is provided with an abnormality discrimination means and the abnormality discrimination means discriminates the presence of an abnormality and the occurrence position of the abnormality on the received I/O port data.