A computing device comprising: a memory storing one or more instructions; and a processor configured to execute the one or more instructions stored in the memory to: perform a first compression on a data object stored in the memory according to a first compression method, store the first compressed data object in a swap data storage area, and reclaim a portion of the memory in which the first compressed data object was stored; register the information about the first compressed data object stored in the swap data storage area, in a first management table comprising a first preference table and a first normal table; register the first compressed data object in the first preference table when a process corresponding to the first compressed data object stored in the swap data storage area is a non-killable process, and register the first compressed data object in the first normal table when a process corresponding to the first compressed data object stored in the swap data storage area is a killable process; preferentially select the first compressed data object registered in the first preference table over the first compressed data object registered in the first normal table, as a second compression target data object in response to the usage ratio of the processor being less than a first threshold value; obtain the information about the first compressed data object from the first management table; perform decompression of the first compressed data object; and perform a second compression on the decompressed first compressed data object according to a second compression method, the second compression method having a lower compression speed performance and a higher compression ratio than the first compression method, store the second compressed data object in the swap data storage area, and reclaim a portion of the swap data storage area in which the first compressed data object was stored. a memory storing one or more instructions; and a processor configured to execute the one or more instructions stored in the memory to: perform a first compression on a data object stored in the memory according to a first compression method, store the first compressed data object in a swap data storage area, and reclaim a portion of the memory in which the first compressed data object was stored; register the information about the first compressed data object stored in the swap data storage area, in a first management table comprising a first preference table and a first normal table; register the first compressed data object in the first preference table when a process corresponding to the first compressed data object stored in the swap data storage area is a non-killable process, and register the first compressed data object in the first normal table when a process corresponding to the first compressed data object stored in the swap data storage area is a killable process; preferentially select the first compressed data object registered in the first preference table over the first compressed data object registered in the first normal table, as a second compression target data object in response to the usage ratio of the processor being less than a first threshold value; obtain the information about the first compressed data object from the first management table; perform decompression of the first compressed data object; and perform a second compression on the decompressed first compressed data object according to a second compression method, the second compression method having a lower compression speed performance and a higher compression ratio than the first compression method, store the second compressed data object in the swap data storage area, and reclaim a portion of the swap data storage area in which the first compressed data object was stored. perform a first compression on a data object stored in the memory according to a first compression method, store the first compressed data object in a swap data storage area, and reclaim a portion of the memory in which the first compressed data object was stored; register the information about the first compressed data object stored in the swap data storage area, in a first management table comprising a first preference table and a first normal table; register the first compressed data object in the first preference table when a process corresponding to the first compressed data object stored in the swap data storage area is a non-killable process, and register the first compressed data object in the first normal table when a process corresponding to the first compressed data object stored in the swap data storage area is a killable process; preferentially select the first compressed data object registered in the first preference table over the first compressed data object registered in the first normal table, as a second compression target data object in response to the usage ratio of the processor being less than a first threshold value; obtain the information about the first compressed data object from the first management table; perform decompression of the first compressed data object; and perform a second compression on the decompressed first compressed data object according to a second compression method, the second compression method having a lower compression speed performance and a higher compression ratio than the first compression method, store the second compressed data object in the swap data storage area, and reclaim a portion of the swap data storage area in which the first compressed data object was stored.