Abstract: An electronic mail decrypting device includes a password candidate extracting unit configured to extract a character string to serve as a password candidate from a text body of an electronic mail; a storing processing unit configured to perform a process of storing the password candidate and attribute information of the electronic mail from which the password candidate has been extracted with the password candidate and the attribute information associated with each other; a password estimating unit configured to estimate a password to be used to decrypt an encrypted file based on attribute information of an electronic mail having the encrypted file attached thereto as well as the stored password candidate and the stored attribute information of the electronic mail from which the password candidate has been extracted; and a decryption processing unit configured to perform a process of decrypting the file by use of the estimated password.

Abstract: To provide an operation support system and the like, which make it possible to share the information that can support operations of a user regarding the operation procedures of GUI input elements. The operation support system includes: an operation content recording control device which acquires operation content of the user executed on an operation screen of a user terminal that includes a plurality of GUI (Graphic User Interface) input elements for operating an input processing system, and records it as an operation log; an additional information managing device which records additional information data that corresponds to a specific operation order of the plurality of GUI input elements for the operation content recorded in the operation log; and an operation log display control device which displays the operation log together with the additional information on the user terminal.

Abstract: An item selecting device includes: a display controlling section for displaying a Venn diagram formed from subsets each of which indicates a selectable item on a display screen, wherein each of areas formed by the Venn diagram corresponds to an item group including at least one of the selectable item; a control section for inputting information of a designated area selected from the areas by an input device; and a selected item judging section for cancelling a designated item which is each of elements of the item group corresponding to the designated area from a selected item list when the designated item is set as an item already selected, and for adding the designated item to the selected item list when the designated item is not set as an item already selected. By this construction, the selected item can be easily changed.