An information processing system for creating a search data for an application-specific data is proposed. An application processing section inputs or edits data on the basis of an application program. An application-specific data storage section stores the application-specific data input or edited by the application processing section. A search data is created by a search data creating section for searching the application-specific data stored in the application-specific data storage section for a specific data. The search data creating section also creates a correspondence between the search data and the application-specific data. A search data storage section stores the search data created by the search data creating section. A correspondence storage section stores the correspondence between the search data and the application-specific data. Further, a data output section connected to and shared by a plurality of data input or editing units including the application processing section and the search data creating section. The search data creating section creates the search data from the application-specific data sent from the application processing section to the data output section.