1. A graphics processing method of a graphics processing unit (GPU), the method comprising: converting a graphics processing of a window system into a vector-based application program interface (API) format accessible by the GPU; and performing, by the GPU, the converted graphics processing, wherein the vector-based API format is based on an OpenVG standard or an Embedded Graphics Library (EGL) standard, and in response to the vector based API format being based on the EGL standard, graphics resources for performing the graphics processing of the window system are managed by an EGL surface and the EGL surface is implemented by an EGL extension.