| 摘要 |
Provided is a search apparatus, a search method, and a program that can improve search speed for a document set even when an object to be searched is a large-scale document set. A search apparatus is used which includes an abstract matrix storage unit 1 that, when information which is created from a plurality of regions of a matrix representing a co-occurrence relationship between a word set and a document set and which represents a subset of the document set is provided, stores abstract information which enables calculation of a frequency of a word in each region, a word frequency calculation unit 2 that, in response to an input of the information representing the subset, examines a relationship between this and each region, refers to the abstract information of each region, and calculates an upper limit of the frequency for the subset of the word by each region, a word frequency calculation unit 3 that adds the upper limit of the frequency for each word region, and specifies the added value as the upper limit of the frequency of the word for each word region, and a document frequency reference unit 4 that obtains a region to be searched from the upper limit of the frequency of the word for each word region, and specifies the specified number of words in order of higher frequency according to this region.
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