A document conversion and use system which converts a first structured document into a second structured document different in structure from the first structured document, comprising: a template storage unit storing a template indicating the structure of the second structured document; a structure specification unit for reading out the template from the template storage unit and causing a user to specify an element or an element content constituting the template; a correspondence definition specification unit for causing the user to define the correspondence definition specification indicating the correspondence between the element in the first structured document and the element in the template; and an unit for analyzing the template structure to specify the element or the element content specified by the structure specification unit, searching for the element defined by the correspondence definition starting from the element or the element content, and performing conversion processing according to the search result.