1. A device running on a processor of the device for executing a hybrid web application written in a web standard language including a system application programming interface (API) call, the device comprising: a web user interface layer that requests a process according to the system API call from a hybrid web application interface layer, and performs a process according to the web standard language using the processor; a hybrid web application interface layer that requests the process corresponding to the system API call from a cross platform system service interface layer in response to the request of the web user interface layer, synchronously or asynchronously receives a result of the process corresponding to the system API call from the cross platform system service interface layer, and transmits the received result to the web user interface layer; and a cross platform system service interface layer that performs a platform dependent operation corresponding to the system API based on the request of the hybrid web application interface layer, wherein the hybrid web application is able to operate independently in various kinds of platforms, and wherein the web user interface layer, the hybrid web application interface layer, and the cross platform system service interface layer are distinct layers.