A method, system, and a computer readable storage medium for visualizing total order relation of nodes included in structured document. The method includes acquiring log information, where the log information is created by storing information on transitions between nodes in a structured document in chronological order. The method also includes specifying a relation of relative positions of the nodes in the transitions based on acquired log information. The method further includes determining a total order relation of the nodes in the structured document by performing a topological sorting that uses specified relation as a constraint, where the total order relation of the nodes is determined by using content data of the node if the node is added to or removed from the structured document.