rotated at a preset speed according to the input dry conditions and the high and low temperature heaters 210 220 are repeatedly turned on off to maintain the inside of the drum at a preset temperature meanwhile the control unit 100 determines in real time whether an abnormal stop such as a stop command is input by the user or an overheating in the dry drum is occurred because the filter is blocked is occurred or not s 114 if the abnormal stop is not occurred during the whole drying operation and then the drying operation is processed according to the input dry condition s 200 and the operation of the dry is decided to stop or continue after determining whether the dry is completed or not s 201 on the other hand the abnormal stop is occurred during the drying operation the high temperature heater is previously turned off s 115 and the low temperature heater is turned off s 116 and after the motor is finally stopped s 117 the safety relay 140 is turned off s 118 and if the cause of the abnormal stop is determined by the control unit 100 to be solved s 119 after determining whether the cause is solved or not the drying operation is normally carried out s 200 and below steps are carried out according to the input dry condition however if the cause of the abnormal stop is not solved the operation of the dry is completed here the expression u201c the cause of the abnormal stop is solved u201d means that the user repress the operation button after pressing the stop button or that the user cleans the filter after he she recognizes a filter block signal as described.