A method for transmitting and receiving system information in a communication system is disclosed. An operation method of a UE comprises the steps of: checking minimum system information included in an SS/PBCH block received from a base station; receiving a PDCCH in a control resource set indicated by the minimum system information; checking a time-frequency resource through which a PDSCH including RMSI is to be transmitted, on the basis of scheduling information included in the PDCCH; and acquiring the RMSI from the PDSCH received in the time-frequency resource. Therefore, the performance of the communication system can be improved.