The present invention discloses a method for estimating an index of a symbol in a wireless communication system and an apparatus therefor. Specifically, a method for estimating an index of a symbol by a terminal in a wireless communication system comprises the steps of: receiving, from a base station, one or more specific synchronization signals through one or more symbols; identifying the indices corresponding to the one or more symbols, based on a predefined pattern configured with multiple specific synchronization signals for a specific time unit and the received one or more specific synchronization signals; and receiving, from the base station, a specific signal, through a specific symbol determined using the identified indices.