Abstract: An agent system for assisting in construction of an e-mail service system comprises a means activated when e-mail is received at a mailbox for fetching the e-mail from the mailbox to extract a process request described in the e-mail, a means for translating the extracted process request into a language for accessing a database referring to a conversion rule dictionary, and passing the translated process request to a database management system, a means for receiving from the database management system a process result obtained by performing the process on the database in accordance with the translated process request and editing the received process result into an e-mail format referring to the conversion rule dictionary, and a means for sending the process result edited into the e-mail format to a desired user as e-mail. The conversion rule dictionary is created by a dictionary editing system.