To sterilize and disinfect a foot, as well as a hand, in a wide range up to an ankle including an athlete's foot-affected area by immersing the foot in an athlete's foot treating medicinal liquid prepared by diluting an athlete's foot treating medicine with an alcoholic based agent.

An inner sock up to the ankle is put on the foot and put in a bag not allowing permeation of the medicinal liquid and the bag is filled with the athlete's foot treating medicinal liquid. The ankle is bound with the chord of the bag, and an upper sock is put on the bag to raise the athlete's foot treating medicinal liquid to the ankle with less amount so that the foot can be widely immersed in the liquid. Since athlete's foot bacteria reside not only on the foot but also in the shoe and sock, the shoe is also immersed in alcohol. The sock is disinfected with alcohol or hot water. The hand is also treated in the same treating manner.