A method and a device of processing synchronization indication information and a method and a device of indicating a synchronization signal block are provided. The method of processing synchronization indication information is applied to a terminal and includes receiving a synchronization signal block sent by a base station; receiving synchronization indication information sent by the base station, the synchronization indication information being used to indicate the synchronization signal block sent by the base station; determining RMSI CORESET, UE-specific CORESET and an other CORESET; determining a time-frequency resource position for data reception according to the multiplexing information and the synchronization indication information.