METHOD, DEVICE, AND COMPUTER PROGRAM THAT DETERMINE AND VISUALIZE ALL ORDER RELATIONS OF NODES INCLUDED IN STRUCTURED DOCUMENT BASED UPON LOG INFORMATION

PROBLEM TO BE SOLVED: To provide a method, a device, and a computer program that correctly and univocally determine and visualize all order relations of nodes included in a structured document based upon log information.SOLUTION: All order relations of nodes included in a structured document are determined based upon log information associated with inter-node transitions and visualized. Log information in which information associated with the transitions between nodes included in the structured document is stored in time series is acquired, and relative position relations between nodes in transitions are specified based upon the acquired log information. Topological sorting is carried out based upon a relative position relation between specified nodes as a restriction condition, and all the order relations of the nodes included in the structured document are determined. When a node is added or deleted as a node included in the structured document, all order relations of nodes are determined based upon data corresponding to the content of the node.