A page information collection program for efficiently collecting pages required to verify a web site. A circulator allows the fiber and semiconductor amplifiers to communicate the lights and signals and operates with fiber grating, which acts as a filter, to output the secondarily-amplified optical signal. A detection window is used to detect the specified pattern. Each of the elastic arms includes an inner fixed arm part, at least one outer movable arm part, and a corner transition part interconnected between the inner fixed arm part and the at least one outer movable arm part.