A key delivery apparatus that prevents improper use of contents, and manages a decryption key for decrypting encrypted content and a suppliable number showing how many times the decryption key is suppliable, with respect to one or more terminal apparatuses connected to a network. A portion of the window is coated with a first wavelength converting material and a portion of the interior surface area is coated with a second wavelength converting material. The invention is particularly applicable with the detection of colon polyps without cathartic preparation or insufflation of the colorectal region. An execution direction, which identifies each of the multiple programs and an execution order for their execution, is generated.