Abstract: The part information providing system includes a part information database a retrieving section, and a notifying section. The part information database stores part information including a price of a first part and identification information of a cheaper second part, serving as a substitute for the first part, in association with identification of the first part. The retrieving section retrieves identification information of a third part, which is a component of a device, from the database and, if the identification information of the third part is associated with that of the second part, retrieves the second part, which serves as a substitute for the third part and is cheaper than the third part, from the part using the identification information of the second part by following a link of the identification information of the second part. The notifying section notifies a user of information about the second part retrieved.

Abstract: An electronic file management system includes a terminal device and a management server. The terminal device includes a terminal storage, a data transmitter, and a first data delete unit. The terminal storage stores an electronic file. The data transmitter transmits the electronic file stored in the terminal storage. The first data delete unit deletes the electronic file stored in the terminal storage. The management server is communicably connected to the terminal device. The management server includes a data receiver and a data storage. The data receiver receives the electronic file from the terminal device. The data storage stores the electronic file received from the terminal device. The first data delete unit deletes the electronic file stored in the terminal storage after the data transmitter has transmitted the electronic file stored in the terminal storage to the management server.