The present invention is a method of milling materials to form a fine powder with a median particle size below 10 micrometer which is suitable for inhalation and which has substantially no amorphous content generated during milling. The electrolyte is set between a negative electrode and a positive electrode. The toner transporting mechanism includes a toner receivingsupplying portion having a toner receiving port and a toner supplying port such that the toner receiving port and the toner supplying port can be removably connected to each other. Herein, the data designate a buffer number and a request type, which represents one of three modes. A frequency-time transformation of the inter-spectral products is performed.