A data write control device includes: a memory that stores a data write control program and data; and a processor that executes the data write control program, wherein the processor: divides data to be downloaded into pieces of divided data; downloads the pieces of divided data; and performs, based on a file system of a storage that is a storage destination to store the data to be downloaded, a first write process of sequentially writing the pieces of divided data into the storage, or a second write process of writing all of the pieces of divided data into the storage at once after all of the pieces of divided data are downloaded.