1. A system for performing a search request and for supporting visualization of a link relationship among a plurality of web pages of a website, the system comprising: a processing unit; and a memory connected to the processing unit, wherein the processing unit is configured to perform: collecting the plurality of web pages of the website; extracting link information representing a link relationship among the plurality of web pages; generating a tree structure based on the extracted link information, the tree structure including a plurality of nodes, each of which corresponds to a respective web page of the plurality of web pages, each of the nodes being associated with a respective uniform resource locator and at least one word associated with the respective uniform resource locator; when two different nodes of the plurality of nodes of the generated tree structure have a same child node corresponding to a same one of the plurality of web pages, representing the same child node in the generated tree structure as a separate first duplicate child node of a first node of the two different nodes and a separate second duplicate child node of a second node of the two different nodes; receiving a search request including a search word; producing a search result tree based on the web pages, the generated tree structure and a search result of the search request; and providing a representation of the search result tree to a display unit for displaying the search result tree, the displayed search result tree indicating which ones of the plurality of nodes correspond to ones of the plurality of web pages satisfying the search request, wherein: the displayed search tree result provides information regarding an overall structure of the website, thereby facilitating a search for information related to the search result, and representation of the same child node in the generated tree structure as the separate first duplicate child node and the separate second duplicate child node avoids overlapping flows in the presentation of the search result tree to facilitate comprehension of the overall structure of the website.