Methods for purchasing of goods or services over the internet. The apparatus includes an outer casing tube, which defines a space whereto conduits are provided for introducing water and steam to generate an emulsion or a conduit for introducing emulsion generated by the water and steam and the surface of which is provided with openings, such as pores or holes, for discharging the emulsion formed by water and steam through the outer casing. The plate rotates with respect to the substrate in response to a voltage applied to a stationary electrode rigidly connected to the substrate. At least part of the protrusion portions are arranged at intervals in a direction intersecting with an insertion direction of the terminal main body.