Method and apparatus for performing conditional pscell addition and change continuously in wireless communication system

A method performed by a terminal in a wireless communication system, the method comprising:

• transmitting, to a base station, capability information of the terminal comprising information indicating that the terminal supports a subsequent conditional primary secondary cell group (SCG) cell (PSCell) addition or change (CPAC);
• receiving, from the base station, a first message comprising conditional reconfiguration information, the conditional reconfiguration information comprising configuration information of at least one candidate PSCell, information on at least one execution condition for a conditional PSCell addition (CPA) or a conditional PSCell change (CPC) of the at least one candidate PSCell, and information associated with the subsequent CPAC;
• in case that at least one execution condition for the CPA or the CPC of a first PSCell among the at least one candidate PSCell is satisfied, transmitting, to the base station, a second message for an addition of the first PSCell or for a change to the first PSCell;
• and
• evaluating the at least one execution condition for the CPA or the CPC of the at least one candidate PSCell after completion of the addition of the first PSCell or the change to the first PSCell, wherein the conditional reconfiguration information is kept in the terminal.