Information processing device, information processing method, and computer program product

An information processing method implemented by an information processing device, comprising:

• performing, by a clustering unit, hierarchical clustering of a key phrase group which includes a plurality of key phrases included in a document group;
• dividing, by a dividing unit, the key phrase group into a plurality of candidate clusters;
• receiving, by an item selecting unit, a selection operation of selecting any one item from among a plurality of predetermined items meant for classifying the document group;
• calculating, by a score calculating unit, for each of the plurality of candidate clusters, a score indicating utility with respect to the selected item;
• deciding, by a deciding unit, as a reference cluster, a candidate cluster for which the score has a predetermined ranking from among the plurality of candidate clusters;
• dividing, by a sub-cluster generating unit, the reference cluster into a plurality of sub-clusters;
• extracting, by a sub-item extracting unit, a plurality of predetermined sub-items in lower levels of the selected item;
• and
• controlling, by an expansion image control unit, presentation of an expansion image with aim of expressing information volume of documents corresponding to each of the plurality of sub-items and corresponding to each of the plurality of sub-clusters.

A computer program product having a computer readable medium including programmed instructions, wherein the instructions, when executed by an information processing device, cause the information processing device to function as:

• a clustering unit that performs hierarchical clustering of a key phrase group which includes a plurality of key phrases included in a document group;
• a dividing unit that divides the key phrase group into a plurality of candidate clusters;
• an item selecting unit that receives a selection operation of selecting any one item from among a plurality of predetermined items meant for classifying the document group;
• a score calculating unit that, for each of the plurality of candidate clusters, calculates a score indicating utility with respect to the selected item;
• a deciding unit that decides, as a reference cluster, a candidate cluster for which the score has a predetermined ranking from among the plurality of candidate clusters;
• a sub-cluster generating unit that divides the reference cluster into a plurality of sub-clusters;
• a sub-item extracting unit that extracts a plurality of predetermined sub-items in lower levels of the selected item;
• and
• an expansion image control unit that controls presentation of an expansion image for expressing information volume of documents corresponding to each of the plurality of sub-items and corresponding to each of the plurality of sub-clusters.