1. A method for analyzing a document structure in a presentation file containing objects, the method comprising the steps of: receiving the presentation file; extracting overlap information between the objects in the presentation file and grouping the objects as a parent-child relationship to obtain a first structured data reflecting the parent-child relationship; grouping the objects as a sibling relationship by using a distance information between the objects to obtain a second structured data reflecting the sibling relationship; generating, in response to detection or designation of existence of arrow graphics representing a link relationship between the objects in the presentation file, link information including the link relationship between the objects and a link label for the arrow graphics; generating meta-information for the presentation file from the generated link information and at least one of the first structured data or the second structured data; and modifying a grouping and a voice read-out order by using the generated meta-information.