1. A method of constructing an optimized network simulation environment, the method comprising the steps of: a) setting communication equipment models for relaying a message to/from real equipments out of communication equipment models of a network model, as major models; b) calculating the order of abstraction priority for the major models; c) performing batch-mode abstraction for non-major models; d) driving a simulation; e) determining whether a difference between a simulation execution time and an actual time spent is within an allowable delay value; f) performing adaptive abstraction for the major models; and g) evaluating a result of the simulation.