To solve the mentioned problem, a method of transmitting a message of a terminal in a wireless communication system according to an embodiment of the present invention comprises the steps of: receiving an RRC connection reestablishment message from a base station; determining whether the RRC connection reestablishment message is a message indicating to set or remove an SCell; determining a setting delay time as a result of the determination; and transferring a response message to the base station on the basis of the setting delay time. According to an aspect of the embodiment of the present invention, reporting the performance of the terminal may minimize the size of performance report messages.