Abstract: The mail relay device 800 includes a determination unit 801 which determines whether or not a received fragment is the last fragment to be received when any of a plurality of fragments generated by splitting an e-mail is received from a transmitting device, a transmission unit 802 which transmits the fragment to a receiving device when the determination unit 801 determines that the received fragment is not a final fragment, and a merging unit 803 which merges all fragments forming the e-mail to reassemble e-mail when the determination unit 801 determines that the received fragment is the final fragment, wherein the transmission unit 802 transmits the final fragment to the transmitting device under the condition that the inspection unit 804 determines that the e-mail is normal.

Abstract: In a data retrieval system which retrieves data of a data base according to a search key entered by a user by means of a search engine to return a retrieval result to the user, an access right attribute value indicative of a range of an access right of the user is set to the data of the data base, and the search key to be registered at the search engine is designed to enable designation of the access right attribute value.

Abstract: If a document is to be referred to in this access right management system of the present invention, a name of the document desired to be referred and a personal information number of a person who refers to the document, are transmitted from a document reference apparatus to a document reference section. The document reference section acquires document data from a document storage section based on the transmitted document name, and transmits the personal information number to a reference section. The reference section acquires personal information from a personal information storage section based on the personal information number, and transmits the result to the document reference section. The document reference section passes the personal information and the document data to a condition determination section, and the condition determination section determines whether or not an access is acceptable.