To realize a cleaning method providing through sanitary control, considering privacy and preventing loss or miscarriage by using exclusive laundry bags.

A laundry bag with an IC is distributed to each predetermined division in facilities, and laundry is put into it. The laundry bag with the IC containing the laundry is collected by the cleaners. Then, the information of the IC is read, and the laundry in the bag is cleaned. The finished laundry is delivered with the collected laundry bag with the IC. Such laundry system is proposed. This system has a method of distributing the laundry bag with the IC prepared by the cleaners to each predetermined division, that is a ward, sickroom and living room or an inpatient and tenant and collecting the laundry bag with the IC by the cleaners to perform cleaning. Since the identifying information for recognizing the division is stored in the IC installed to the laundry bag, the cleaners side can read and grasp whose laundry it is and where the person is from to a personal computer from the IC and can take charge individually.