A system and method for installing a large-sized filtering membrane module to a frame structure with easiness is disclosed, wherein the system comprises a frame structure to which the filtering membrane module is to be installed; and an installing apparatus for installing the filtering membrane module to the frame structure, wherein the installing apparatus comprises a horizontal rod parallel to an inserting direction of the filtering membrane module into the frame structure; and a moving unit movable toward the frame structure along the horizontal rod while supporting the filtering membrane module.