A method for receiving downlink control information (DCI) in a communication system is provided. The method includes identifying a starting resource block of the allocated resource associated with an active bandwidth part based on a starting resource block associated with the initial bandwidth part and a scaling parameter, when a size for the DCI of DCI format 1_0 in a user equipment (UE) specific search space (USS) is derived from a size of the initial bandwidth part and the DCI of DCI format 1_0 is applied to the active bandwidth part, and identifying a length of contiguously allocated resource blocks of the allocated resource associated with the active bandwidth part based on a length contiguously allocated resource blocks associated with the initial bandwidth part and the scaling parameter.