To provide an apparatus that can reduce cumbersome input by a user, while being capable of indicating changes efficiently. Files F1, F2 . . . are recorded in a recording part 8. The file F1 is an old version, and the file F2 is an updated new version. A difference extraction means 2 compares the file F1 which is the old version with the file F2 which is the new version, and extracts difference between the versions. On the basis of a difference condition 6 that is recorded in advance, a change notification means 4 determines whether each extracted difference satisfies the difference condition. The change notification means 4 notifies, to a terminal apparatus 10 of a user who registers the difference condition 6, the changed part, when the extracted difference satisfies the difference condition.