An operating method of a terminal to communicate with a base station, includes: detecting at least one overlapped third control channel element (CCE) in a plurality of first CCEs included in first search spaces corresponding to a first physical downlink control channel (PDCCH) received from a first transmission and reception point (TRP) of the base station, and in a plurality of second CCEs included in second search spaces corresponding to a second PDCCH received from the first TRP and a second TRP of the base station; determining, based on the at least one overlapped third CCE, object CCEs from the plurality of first CCEs and the plurality of second CCEs; and performing channel estimation of the object CCEs by using a first memory.