A terminal for managing a bandwidth part in a wireless communication system, the terminal comprising: a transceiver; and at least one processor configured to: receive, from a base station, a radio resource control, RRC, message including bandwidth part, BWP, configuration information, wherein based on the BWP configuration information, a first BWP is configured with a first active BWP activated from dormancy and a second BWP is configured with a dormant BWP, characterized in that the at least one processor is further configured to: receive (1n-05, 1n-10), from the base station, downlink control information, DCI, including a bitmap, wherein a bit of the bitmap indicates which BWP is activated as a downlink, DL, BWP, in case (1n-15, 1n-20) that a value of the bit of the bitmap is 0, determine an active DL BWP configured for at least one secondary cell, SCell, belonging to a SCell group corresponding to the bit among at least one SCell group as the second BWP, and in case (1n-15, 1n-25) that the value of the bit of the bitmap is 1: determine whether a current active DL BWP configured for the at least one SCell belonging to the SCell group corresponding to the bit is the second BWP, in case that the current active DL BWP is the second BWP, set the active DL BWP to the first BWP, and in case that the current active DL BWP is not the second BWP, determine to maintain the current active DL BWP, wherein each bit of the bitmap corresponds to each of the at least one SCell group in ascending order of an identifier of each of the at least one SCell group from most significant bit, MSB, to least significant bit, LSB. a transceiver; and at least one processor configured to: receive, from a base station, a radio resource control, RRC, message including bandwidth part, BWP, configuration information, wherein based on the BWP configuration information, a first BWP is configured with a first active BWP activated from dormancy and a second BWP is configured with a dormant BWP, characterized in that the at least one processor is further configured to: receive (1n-05, 1n-10), from the base station, downlink control information, DCI, including a bitmap, wherein a bit of the bitmap indicates which BWP is activated as a downlink, DL, BWP, in case (1n-15, 1n-20) that a value of the bit of the bitmap is 0, determine an active DL BWP configured for at least one secondary cell, SCell, belonging to a SCell group corresponding to the bit among at least one SCell group as the second BWP, and in case (1n-15, 1n-25) that the value of the bit of the bitmap is 1: determine whether a current active DL BWP configured for the at least one SCell belonging to the SCell group corresponding to the bit is the second BWP, in case that the current active DL BWP is the second BWP, set the active DL BWP to the first BWP, and in case that the current active DL BWP is not the second BWP, determine to maintain the current active DL BWP, wherein each bit of the bitmap corresponds to each of the at least one SCell group in ascending order of an identifier of each of the at least one SCell group from most significant bit, MSB, to least significant bit, LSB. receive (1n-05, 1n-10), from the base station, downlink control information, DCI, including a bitmap, wherein a bit of the bitmap indicates which BWP is activated as a downlink, DL, BWP, in case (1n-15, 1n-20) that a value of the bit of the bitmap is 0, determine an active DL BWP configured for at least one secondary cell, SCell, belonging to a SCell group corresponding to the bit among at least one SCell group as the second BWP, and in case (1n-15, 1n-25) that the value of the bit of the bitmap is 1: determine whether a current active DL BWP configured for the at least one SCell belonging to the SCell group corresponding to the bit is the second BWP, in case that the current active DL BWP is the second BWP, set the active DL BWP to the first BWP, and in case that the current active DL BWP is not the second BWP, determine to maintain the current active DL BWP, determine whether a current active DL BWP configured for the at least one SCell belonging to the SCell group corresponding to the bit is the second BWP, in case that the current active DL BWP is the second BWP, set the active DL BWP to the first BWP, and in case that the current active DL BWP is not the second BWP, determine to maintain the current active DL BWP, wherein each bit of the bitmap corresponds to each of the at least one SCell group in ascending order of an identifier of each of the at least one SCell group from most significant bit, MSB, to least significant bit, LSB.