Patent Document ID: 7647303
Application ID: 11219464

Base Claim:
1. A document processing apparatus for searching a document from registered documents according to a plurality of search methods, comprising: an acquiring unit adapted to acquire a plurality of character strings from a target document in the registered documents; a receiving unit adapted to receive an information which indicates a search method selected from the plurality of search methods by a user; an optimizing unit adapted to optimize the acquired character strings to obtain blocks by joining at least two of the acquired character strings into one of the blocks or dividing at least one of the acquired character strings into some of the blocks according to the search method indicated by the information; a creating unit that creates an index of the target document from each of the blocks optimized by said optimizing unit; and a document searching unit that performs a document searching process by using the created index.

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Claim 2:
2. The document processing apparatus as claimed in claim 1 , wherein the plurality of search methods include a first search method for searching a document based on a relation between words included in each of the character strings in the target document, and wherein said optimizing unit optimizes the acquired character strings into first blocks each forming a sentence as the blocks, in the case where the first search method is selected by a user.