Apparatus and method for web page access

1. An apparatus for structuring a web page access history, the apparatus comprising:

a topic extractor configured to extract topics from previously-accessed web pages;

a mapper configured to map the topics onto respective nodes of an ontology-based data structure, wherein each node of the data structure corresponds to a respective topic and the data structure comprises a directed graph comprising edges corresponding to hierarchical relationships between the nodes; and

a summary graph generator configured to generate, based on the data structure, a hierarchical summary graph comprising nodes that each include a topic of the extracted topics; and

a user interface configured to display the summary graph and information for accessing the previously-accessed web pages,

wherein the information for accessing the previously-accessed web pages comprises any one or any combination of any two or more of a hyperlink, a uniform resource locator (URL), a uniform resource name (URN), and an image hyperlinked to the URL or the URN.

2. The apparatus of claim 1 , wherein the topic extractor is configured to extract the topic from the previously-accessed web page by using any one or any combination of any two or more of a topic word approach, a lexical chain approach, a latent semantic analysis (LSA), a probabilistic latent semantic analysis (PLSA), and full blown Bayesian topic models.

3. The apparatus of claim 1 , wherein the ontology-based data structure is based on an ontology model generated in advance outside the apparatus.

4. The apparatus of claim 1 , further comprising a session manager configured to manage the at previously-accessed web page in a session to enable the summary graph to be generated in a session.

5. The apparatus of claim 1 , further comprising an access history collector configured to collect an access history of the previously-accessed web page.

6. The apparatus of claim 1 , further comprising a summary graph integrator configured to integrate the summary graph and another summary graph to generate an integrated summary graph.

7. A method of structuring a web page access history, the method comprising:

extracting topics from previously-accessed web pages;

mapping the topic onto a node of an ontology-based data structure, wherein each node of the data structure corresponds to a respective topic and the data structure comprises a directed graph comprising edges corresponding to hierarchical relationships between the nodes; and

generating, based on the data structure, a hierarchical summary graph comprising nodes that each include a topic of the extracted topics; and

a user interface configured to display the summary graph and information for accessing the previously-accessed web pages,

wherein the information for accessing the previously-accessed web pages comprises any one or any combination of any two or more of a hyperlink, a uniform resource locator (URL), a uniform resource name (URN), and an image of a web page hyperlinked to the URL or the URN.

8. The method of claim 7 , wherein the extracting of the topic from the previously-accessed web page comprises extracting at least one topic from the web page by using any one or any combination of any two or more of a topic word approach, a lexical chain approach, a latent semantic analysis (LSA), a probabilistic latent semantic analysis (PLSA), and full blown Bayesian topic models.

9. The method of claim 7 , further comprising, prior to extracting the topic from the previously-accessed web page, collecting an access history of the previously-accessed web page.

10. The method of claim 7 , further comprising, subsequent to the generating of the summary graph, integrating the generated summary graph with another summary graph.

11. An apparatus for structuring a web page access history, the apparatus comprising:

a topic extractor configured to extract topics from previously-accessed web pages;

a semantic relations analyzer configured to analyze semantic relations between the extracted topics; and

a summary graph generator configured to generate, based on the semantic relations, a summary graph comprising an ontology-based data structure including a directed graph that includes a node for each of the topics and edges corresponding to hierarchical relationships between the nodes, wherein the data structure is configured to provide information for accessing the previously-accessed web pages,

wherein the information for accessing the previously-accessed web pages comprises any one or any combination of any two or more of a hyperlink, a uniform resource locator (URL), a uniform resource name (URN), and an image hyperlinked to the URL or the URN.

12. The apparatus of claim 11 , wherein the topic extractor is configured to extract the topic from previously-accessed web page by using any one or any combination of any two or more of a topic word approach, a lexical chain approach, a latent semantic analysis (LSA), a probabilistic latent semantic analysis (PLSA), and full blown Bayesian topic models.

13. The apparatus of claim 11 , wherein the semantic relations analyzer is configured to analyze the semantic relations between the extracted topic and the other topic based on a pre-established ontology model.

14. The apparatus of claim 11 , further comprising a session manager configured to manage the previously-accessed web page in a session to enable the summary graph to be generated in a session.

15. The apparatus of claim 11 , further comprising an access history collector configured to collect an access history of the previously-accessed web page.

16. The apparatus of claim 11 , further comprising a summary graph integrator configured to integrate the summary graph and another summary graph to generate an integrated summary graph.

17. An apparatus for web page access, the apparatus comprising:

a topic extractor configured to extract topics from previously-accessed web pages;

a mapper configured to map the topics onto respective nodes of an ontology-based data structure, wherein each node of the data structure corresponds to a respective topic and the data structure comprises a directed graph comprising edges corresponding to hierarchical relationships between the nodes; and

a summary graph generator configured to generate, based on the data structure, a hierarchical summary graph comprising nodes that each include a topic of the extracted topics; and

a user interface configured to display the summary graph and information for accessing the previously-accessed web pages,

a data structure update processor configured to update, based on the generated summary graph, the data structure with information for accessing the previously-accessed web pages,

wherein the information for accessing the previously-accessed web pages comprises any one or any combination of any two or more of a hyperlink, a uniform resource locator (URL), a uniform resource name (URN), and an image hyperlinked to the URL or the URN.

18. The apparatus of claim 17 , wherein the summary graph generator is further configured to store the data structure in a memory.

19. The apparatus of claim 18 , wherein the apparatus further comprises an access history retrieval processor configured to provide the summary graph, the node, and the information on a user interface on a display screen.

20. The apparatus of claim 19 , wherein the access history retrieval processor is configured to allow a user to select a time period and to allow the user to select a web page based one or more topics related to the web page.