A method of hiding data comprising creating a histogram of an attribute of a first data set. The sputtered material is ionized in a processing space between the target and a substrate by generating a dense plasma in the space with energy coupled from a coil located outside of the vacuum chamber behind a dielectric window in the chamber wall at the center of the opening in the sputtering target. A through hole is formed in the gate insulating film of the TFT substrate, and the columnar spacer is disposed so as to cover a concave portion formed by the through hole. The display device may be coupled to the apparatus and may be configured to display a color image formed of the differently colored images. The application receives the emoticons or abbreviations determined by the keyboard driver and displays an image corresponding to the emoticons or abbreviations.