Methods and systems for generating playlists of media items with audio data are disclosed. The printhead includes electrical and mechanical structure for controlling the ejection of the ink. The shale hydration inhibition agent should be present in sufficient concentration to reduce the swelling of the shale clay. inner wall members extending from the central hole of the cap and gripping the narrow tube; and iii. The device includes a detection unit for detecting a region in which a movement amount is small, out of a plurality of regions in which the sub picture image may be superposed on the moving picture image which forms a base, and a picture image superposing unit for superposing the sub picture image on the region in which the movement amount is small, the region being detected by the detection unit. Thus, a user can be swiftly informed of the description of the content of warning and coping strategies.