The present invention is characterized to include a first washing step of removing impurities from scalp and hair, an applying step of applying a mixture of henna and 15° C. to 25° C. water in a ratio of 1:1 to 1:5 to the scalp and the hair and aging for one to two hours with the scalp and the hair covered with an air blocking cover, a second washing step of washing the scalp and the hair to remove the mixture, a drying step of thermally drying the scalp and the hair by a drier providing air at 60° C. to 100° C., and a stimulating step of providing any one or more of an electrical stimulus and a physical stimulus to the scalp for 10 to 30 minutes by a device providing meridian scrapping or a higher frequency.
