Abstract: With an operation information supplement instructing unit (16), a service progress dependent information storage unit (11), a service progress dependent information search unit (12) and a service progress dependent information answering unit (13) provided, when the operation information supplement instructing unit (16) is pressed, the service progress dependent information search unit (12) searches the service progress dependent information storage unit (11) for supplemental contents recorded in pair with the same service progress as a current service progress (information indicating how far service progresses) and presents the searched supplemental contents to a user through the service progress dependent information answering unit (13).

Abstract: A data processing device includes means (103) for receiving a signal of an object identifier uniquely assigned to an object, and means (104) for executing a plurality of application programs corresponding to the received object identifier. A plurality of applications can be processed on the basis of an object identifier so that the operation can be simplified. When the device include a client terminal (105) and an application server (108), data processing is possible even when they are located in remote sites.

Abstract: With an operation information supplement instructing unit (16), a service progress dependent information storage unit (11), a service progress dependent information search unit (12) and a service progress dependent information answering unit (13) provided, when the operation information supplement instructing unit (16) is pressed, the service progress dependent information search unit (12) searches the service progress dependent information storage unit (11) for supplemental contents recorded in pair with the same service progress as a current service progress (information indicating how far service progresses) and presents the searched supplemental contents to a user through the service progress dependent information answering unit (13).

Abstract: An electronic mail cataloging and retrieving system comprises an electronic mail communication unit, an electronic mail storage unit for storing electronic mails, a tray information storage unit for storing information on classification types used for classification of electronic mails and a format for relating electronic mails to said classification types, an electronic mail object storage unit for storing an electronic mail object related to each electronic mail stored in the electronic mail storage unit, a header information display control unit for showing header information and electronic mail attribute information on a prescribed electronic mail in the form of an at-a-glance guide, a tray display control unit showing tray information which shows that a prescribed electronic mail is classified into a prescribed classification type, and an electronic mail editing means for showing and editing the content of an electronic mail.