A structured document management system for managing a structured document is disclosed, the system including: an element registration unit for registering attribute information and content information about each of elements in the structured document as element information; a structural information registration unit for registering relations between the elements in the structured document as binary format structural information; and an information retaining unit for retaining the element information registered by the element registration unit as records of a relational database while preserving the binary format structural information registered by the structural information registration unit.