Abstract: The present invention relates to a virtual golf device and virtual golf system providing various putting information. The virtual golf device comprises a hitting mat on which an actual golf ball is placed and an image providing means that provides a putting information image on the hitting mat or near a user hitting the actual golf ball, wherein the putting information comprises a swing trajectory image that shows a swing trajectory during putting.

Abstract: The present invention relates to a golf ball location ascertaining method and a golf play information providing system. The golf ball location ascertaining method comprises a first step of ascertaining a motion location at which a predetermined motion is taken when a golfer located near a golf ball on a golf field takes the predetermined motion, and a second step of ascertaining the location of the golf ball on a golf course by using golf course data on the golf field and the motion location.

Abstract: Disclosed in a method for detecting the spin of a ball in motion, a virtual golf device and a virtual golf system using the same. The method for detecting the spin of the ball in motion comprises an image acquisition step of acquiring a first image of the ball at a first time and acquiring a second image of the ball at a second time, the ball being in motion with spin and having an identifier, an identification information acquisition step of acquiring first identification information of the identifier from the first image and acquiring second identification information of the identifier from the second image, and a spin detection step of determining an estimated spin by using cumulative spin data, and applying the estimated spin to the first and second identifier information to detect the spin of the ball in motion.