A method for data management by a computer coupled to a solid state drive (SSD), the SSD being configured to include blocks and channels, each of the blocks being a first area as a unit of data deletion and being configured to include pages, each of the pages being a second area as a unit of data access in the SSD, each of the channels being a transmission and reception route of data to and from the block, the method includes: executing allocation processing for allocating, to a management target having a fixed length determined, a logical block including the blocks coupled to different channels, executing management processing for, when a size of a division management target is more than a size of the page, allocating the division management target to the pages coupled to the different channels included in the logical block allocated to the management target.