A disclosure for measuring an aggregated carrier cell measuring an aggregated carrier cell configured with multiple component carriers is provided. In the disclosure, a user equipment receives, from a base station, a measurement period parameter for measuring a component carrier. The user equipment calculate a measurement period for a non-active component according to the received measurement period parameter and a signal measurement estimation value of the non-active component carrier, and performs measurement on the non-active component carrier with the calculated measurement period for the non-active component.