A system for controlling priority in a SCA-based application having a plurality of components wherein each of the components has a plurality of ports, includes: a priority component scheduler, interworking with the plurality of components wherein component priority order of the components is arranged therein; and a priority port scheduler that is provided in each of the components including the plurality of the ports which are associated with connections between the components, wherein port priority order of the ports included in each of the components is arranged therein. The priority component scheduler may be generated by using domain profiles in which component priority values of the components are set and the priority port scheduler may be generated by using domain profiles in which port priority values of the ports included in each of the components are set. Further, the domain profiles may be XML files.