| 摘要 |
PROBLEM TO BE SOLVED: To provide a file storage function capable of adding a storage medium to increase storage capacity without changing a tree structure of directory seen by a user. SOLUTION: If storage medium capacity for storing a file is insufficient, the file is stored by making on the storage medium to which the same path as a path to a file storage place on the medium is added. Moreover, if the file cannot be stored in an existing storage medium because an existing file is edited and its size becomes too large, a path up to the directory which has been storage destination to the present time is generated on another medium having vacant capacity to store the file there.
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