A memory swapping method and a data processing system using the same, the memory swapping method including receiving queue information for a memory swapping task from a host device; performing part of the memory swapping task in a storage device based on the queue information; receiving a command corresponding to the queue information from the host device after performing of the part of the memory swapping task is completed; and performing a remaining part of the memory swapping task according to the command by using a result of the part of the memory swapping task that had been previously performed.