The present invention is intended for all documents and specifically provides matters-of-interest to users and characteristic information of those matters-of-interest in correspondence to identifiers within the documents and allows related services to be utilized through these documents. An information display system 1 having an input device 11, a display device 10, a memory device 7, an information display software 15 that reads document data, and a CPU 5, wherein the memory device 7 comprises a usable information storage unit 17 that describes multiple matters-of-interest, identifiers which identify one or more matters-of-interest from among the multiple matters-of-interest, characteristic information of each matter-of-interest, and related information of each matter-of-interest, with the association with the identification information of the matters-of-interest; and a program storage unit 14 that stores computer software executed by a CPU 5; the system comprises functions forreceiving from the input unit the selection of an identifier type to be extracted from document data by a system software 16, specifying an identifier pertaining to the selection in the document data read by the information display software 15, requesting the usable information storage unit 17 or the information delivery server system 3 for the characteristic information of a matter-of-interest based on the specified identifier,acquiring the characteristic information of the matter-of-interest based on the specified identifier from the usable information storage unit 17 or the information delivery server system 3, displaying the acquired characteristic information in a display device by embedding the information in the vicinity of the location of the identifier, andutilizing related information of the matter-of-interest via the identifier and characteristic information.