A method of binding elements of a structured document to an observer structure includes obtaining the logical structure of a document. Substrates are transported into a lock by a transport element. The toner is composed of a material containing a resin as a main component and rutile-anatase type titanium oxide. Thereafter, the receiving apparatus changes the state of the data broadcasting content to visible when receiving the presentation start instruction message. According to the present invention, it becomes possible to provide an organic compound having excellent characteristic of high stability in a thin film state, and the emission efficiency and durability of conventional organic EL devices can be remarkably improved. The welded joint is inhibited in the formation of the fine-grained HAZ exhibiting a significantly reduced creep strength.