To safely, easily and efficiently execute a processing such as a hair permanent, hair dyeing, bleaching, a treatment or the blood circulation promotion of skin such as head skin, by applying a first permanent agent having a reduction actuation to hair, applying the second permanent agent having an oxidizing actuation after that and processing with carbon dioxide.

A carbon dioxide processing to hair and skin is executed by a slow pH reducing actuation of carbon dioxide. After the first permanent agent is applied, the second permanent agent is applied and, moreover, the processing is executed by processing carbon dioxide so that an alkali agent to be the cause of damage hair, which is left in hair, is neutralized by carbon dioxide. Besides, since the oxidizing actuation of an oxidizing agent in the second permanent agent is promoted by pH reduction and the oxidizing re- connection of cystine connection in hair which is cleavaged by the first permanent agent is promoted, the finish and fixation of the permanent are improved. A hair cap is put on the head and carbon dioxide is supplied so that the carbon dioxide processing of hair and skin is executed.