Disclosed is a method for performing a network optimization process in a mobile communication system. The method includes receiving UpLink Radio Frequency (UL RF) information about a UL signal which a at least one eNB receives from a device in which a drive test is performed, receiving DownLink (DL) RF information about a DL signal which the device receives from the at least one eNB, predicting an RF environment and performance for the at least one eNB based on the received UL RF information and DL RF information, and determining at least one parameter for network optimization which is applied to the network optimization process based on the predicted RF environment and performance for the at least one eNB.