A light source module is provided, which includes at least one light emitting unit and at least one light guide element. The optical member 15 includes a prism diffuser plate 15a for diffusing light emitted from the light sources 17 and exiting from a lens sheet 15c arranged closer to the light-exiting portion 15z than the prism diffuser plate 15a. With these mechanisms and methods, it is possible to process structured information into a form usable by a knowledge engine.