in the washing machine 200 reaches a second threshold value when receiving the third command signal the laundry transporting robot arm 310 is configured to be automatically stopped when receiving the fourth command signal the washing machine 200 is configured to close the lid thereof put a detergent and a softener into the washing tub from the dispenser 220 and start a washing operation when washing is completed i e when the washing operation is stopped the washing machine 200 is subsequently configured to send a washing completion notifying signal to the control device 900 and simultaneously open the lid thereof when receiving the washing completion notifying signal the control device 900 is then configured to send a fifth command signal to the drying machine 250 and send a sixth command signal to the laundry transporting robot arm 310 when receiving the fifth command signal the drying machine 250 is configured to open the lid thereof when receiving the sixth command signal on the other hand the laundry transporting robot arm 310 is configured to pick up the laundries ld from the washing machine 200 on a one by one basis and put the laundries ld into the drying machine 250 subsequently the control device 900 is configured to send a seventh command signal to the laundry transporting robot arm 310 send an eighth command signal to the washing machine 200 and further send a ninth command signal to the drying machine 250 when the weight measured value of the first weight sensor 210 embedded in the washing machine 200 reaches a third threshold less than.