The present disclosure relates to a communication technique and a system thereof for fusing, with loT technology, a 5G communication system for supporting a higher data transmission rate than a 4G system, and may be applied to intelligent services on the basis of 5G communication technology and loT related technology. The present disclosure provides a method performed by a first network entity comprising: transmitting, to a second network entity, a first message for a monitoring event, the first message including information on a monitoring duration and information on a time; and receiving, from the second network entity, a second message as a response to the first message, wherein the time indicates time information for which at least one monitoring event report detected for at least one terminal in a group is aggregated before transmitting the aggregated at least one monitoring event report, and wherein the time is less than the monitoring duration.