A structure editing apparatus and a picture structure editing apparatus capable of modifying or correcting a structure created in advance with data having a range (segment) set as a structural unit while utilizing original structure information as much as possible are provided. Each apparatus includes a first designating unit designating an arbitrary segment in structure information as a target segment; a second designating unit designating an arbitrary position included in a range of the target segment; and a segment dividing unit dividing the range of the target segment into two segments, i.e., a first half segment and a second half segment with the position designated by the second designating unit set as a dividing position, and replacing the target segment by the two segments.
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