[Solving Means] An information processing apparatus (10) includes: a compressing-and-writing unit (103) that compresses a file-to-be-written, and writes the compressed-file in a memory area; and a total-file-size calculating unit (102) that calculates a total-file-size, the total-file-size being a total value of file-sizes of one or more already-written compressed-files, and updates the total-file-size with a sum of a compressed-file-size and the total-file-size, the compressed-file-size being a file-size of the written compressed-file.