1. A method for a node to correct reference time in a wireless communication system formed of a plurality of nodes, the method
receiving messages broadcasted from neighbor nodes;
calculating amounts of changes in receiving times that are differences between receiving times when the messages are currently
received and receiving times when the messages are previously received with respect to the neighbor nodes; and
correcting the reference time based on the amounts of changes calculated with respect to the neighbor nodes, including
summing the amounts of changes in the receiving times of the neighbor nodes to obtain a sum, and dividing the sum by the number
of nodes obtained by adding 1 to the number of neighbor nodes, to thereby calculate an average value; and
correcting the reference time using the average value.