1. An operation method of a first terminal in a vehicle-to-everything (V2X) communication system, the operation method comprising:performing V2X communication with a second terminal in a first carrier based on an original semi-persistent scheduling (SPS) configuration applying to the first carrier;
receiving sidelink control information (SCI) from the second terminal, the SCI including a changed SPS configuration to be applied to aggregated carriers including the first carrier and a second carrier, the changed SPS configuration including first information elements for the first carrier and second information elements for the second carrier which is configured to be different from the first carrier in a frequency domain;
performing the V2X communication with the second terminal in the first carrier based on the first information elements included in the changed SPS configuration; and
performing the V2X communication with the second terminal in the second carrier based on the second information elements included in the changed SPS configuration.