An operating method of a terminal in a wireless communication system including a cell and the terminal includes receiving an external signal including a synchronization signal block (SSB) from the cell, the SSB including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), obtaining a cell identification number of the cell using the PSS and the SSS, determining a plurality of decoding priorities of a plurality of candidate indexes of the SSB, and performing decoding on the PBCH based on the plurality of decoding priorities.