The present invention defines a document structure of a tree structure and a hierarchical document model in the creation and management of a document, which is an artifact generated in a software development project, and expresses and manages the dependency between documents, thereby making it possible to create a consistent document Software documentation system and its method of operation. Many of the documents generated during the process of software development have a lot of related contents, which makes it difficult to maintain consistency in software modification, modification, and maintenance. Giving.;Therefore, in the present invention, the apparatus has a device that enables to easily create a document while hierarchically defining the relationship between the contents of the document, such as the relationship between the document section, section and paragraph, paragraph and paragraph, And a relationship management device for automatically generating a relationship in an upper layer according to a change in the association relationship of the hierarchy and maintaining the relationship when changing or deleting the relationship. In addition, it provides a template that is pre-created so that these documents do not need to be created from the beginning, and a device and its operating method which make it easy to make a document while modifying it can be classified into a document structure model of a trigger structure, It is easy to create documents that can occur during the software development process and maintain them consistently.
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