1. A virtual golf simulation device comprising: a sensor for sensing flight of a ball hit by a golfer; an image processor for processing a simulated image of a virtual golf course and a simulated image of a flight trajectory of the ball sensed by the sensor; a database including a text storing part for storing text data corresponding to predetermined voice guides to provide voice guidance to the golfer; a voice converter for converting predetermined text data among the text data stored in the text storing part to voice; and a controller for identifying a situation to trigger voice guidance to the golfer, extracting or combining the predetermined text data, and outputting the extracted or combined text data to the voice converter.