Public cultural sharing service plays an important role in the public cultural platform. The recommender systems can bring users useful cultural resources and information. For safety and security reasons of the cultural resources, the external applications are not allowed to directly access the original resource data stored in the cultural databases by sending recommendation requests. The cultural recommender system needs a way to isolate the cultural resources from the outside while keeping the recommendation services. To address this issue, this paper proposes Representational State Transfer (REST)-based architecture of the cultural recommender system that can provide loosely coupled structures for system modules while maintaining the security access of the cultural resources.