A method for determining the validity of a system information block (SIB) by a terminal in a wireless communication system, and an apparatus supporting the same. The method includes: receiving, from a serving cell, a first version index indicating a version of a first system information block; determining a valid sub index to be mapped to a terminal capability of the terminal, among a plurality of sub-indices configuring the first version index; and comparing a valid sub index of a second version index indicating a version of a second system information block stored in the terminal with a valid sub index of the first version index, so as to determine whether the version of the first system information block is identical to the version of the second system information block.