Abstract: A method for increasing a moisture content of a skin and improving skin elasticity by improving a moisture retaining function of a dermis without generating steam, mist and the like, and a beauty apparatus that supplies moisture to a skin are provided. A user is irradiated with positive and negative ions which are generated by using ion generation means 6 and carried by a low-speed air current from a blower 7, and a concentration of the ions for irradiating a skin surface is elevated to be a predetermined value or more, whereby the positive and negative ions react to produce water, which moistens the skin, and improves skin elasticity. Further, when the ions supplied from the ion generation means 6 is released from a blowoff port 61, the blowing speed is controlled at a low level while elevating the ion concentration.