A method of modeling power consumption of an integrated circuit and an apparatus for supporting the same are provided. The method of modeling power consumption of an integrated circuit includes: grasping information about a clock gating enable signal of the integrated circuit; determining a modeling level using a change rate of the number of the clock enable signal; and extracting a power state according to the modeling level and the number of the clock gating enable signal and modeling power consumption in the power state. Thereby, because a power state can be defined with only the number of a clock gating enable signal, a dynamic power consumption amount can be quickly and accurately estimated.