A method of performing a conditional handover by a UE may include: receiving an RRC message associated with the conditional handover; performing a first conditional handover to a first candidate cell among a plurality of candidate cells based on the RRC message; and in a case where the first conditional handover is successful, performing a random access to the first candidate cell, and in a case where the first conditional handover fails, when a second candidate cell that meets a condition exists, performing a second conditional handover to the second candidate cell.