1. A system for generating a building information modeling (BIM) geometry breakdown structure, comprising: a computer device; and a non-transitory storage medium containing program instructions, execution of which by the computer device causes the system to provide functions of: a geometry breakdown system (GBS) range setting module configured to set a range of a GBS based on previously generated BIM framework variables; a GBS element definition module configured to generate standard information breakdown property information that is used to manage work-type breakdown and location breakdown, to generate project numbering system (PNS) property information that is used to manage a work breakdown system (WBS), a cost breakdown structure (CBS), and a standard-method-of-measurement (SMM) breakdown structure (MBS), and to generate GBS property information that is used to define geometric information; and a GBS geometric object coding module configured to match geometric objects to the standard information breakdown property information and the PNS property information generated by the GBS element definition module, and to assign numbers corresponding to the GBS property information to the matched geometric objects.