user first as shown in fig2 the control panel includes the hot key 50 for inputting the anti yellow course and a display part 60 for displaying whether the inputted anti yellow course is selected or not as shown in fig3 the control panel includes the hot key 70 for inputting the anti bacteria course and a display part 80 for displaying whether the inputted anti bacteria course is selected or not as the user selects the hot key 50 or 70 corresponding to the anti yellow course or the anti bacteria course the anti yellow or anti bacteria washing stroke is performed and the corresponding washing state is displayed on the display part 60 or 80 during performing the anti yellow or anti bacteria washing stroke the anti yellow washing stroke using the above drum washing machine according to the present invention will be described with reference to fig4 and 5 first after the user puts the laundry into the inside of the washing machine the user selects the desired stroke course at this time whether the user selects the anti yellow course or not is sensed s 10 if the user selects the anti yellow course a first preset time period t1 is determined as a washing stroke time and a first preset temperature t1 is determined as a temperature of the washing water for the anti yellow course in this state according.