Abstract: Disclosed is a method of operating a swap memory device configured to communicate with a host device and a main memory device. The method includes receiving, from the host device, a request corresponding to target data, determining, by the swap memory device, a first address of the target data and a second address of a target data block that includes the target data, based on the request, providing, by the swap memory device, the target data to the host device based on the first address, and providing, by the swap memory device, the target data block to the main memory device based on the second address.