To prevent excessive loading of the laundry and to wash/dry a proper weight of the laundry in a washer dryer.

A radio IC tag 2 is pasted to the laundry 1. The washer dryer 10 reads the radio IC tag 2 by a reading means 3 in the washer dryer and obtains the information including the weight of the laundry 1 to compute the total weight of the laundry present inside the washer dryer. If the computed total weight of the laundry exceeds the range of optimum weight, the difference from the optimum weight is computed, and at least one article of the laundry, equivalent to the difference, is detected. Then, an announcing means 9 is made to give an instruction to remove the detected at least one article of the laundry.