A drawing structure for use in a storage device of server is disclosed, which is combined with at least a storage device and includes: a housing, a carrier, an operation unit and an elastic member. Search engine index quality is measured based on the number of encountered documents that are indexed by the search engine index. A graphics information control unit 1414 selects graphics information to be rendered, based on a stream event obtained by a stream event reception unit 1416 and the graphics information stored in the graphics information storage unit 1413.