INFORMATION PROCESSOR, INFORMATION PROCESSING METHOD, PROGRAM, AND MEDIUM

摘要

PROBLEM TO BE SOLVED: To describe information with an expression representation and to efficiently process the information described with the expression representation.SOLUTION: An information processor includes a storage part for storing object information described by an identifier, a product operator for connecting a plurality of identifiers as a string of factors having an order, and a sum operator for constituting a combination of items from either or both of the identifier and the plurality of identifiers connected as the string of factors, and a position information calculation part for calculating a position expression including a position in the object information of an item of interest including respective identifiers of interest and positions in the item of interest of the respective identifiers of interest about the respective identifiers in the object information.