Abstract: A data management system that facilitates table merges without the necessity of knowledge about a database or creating an environment therefore is provided. With a processor unit, a merging sheet (merged table) for merging a plurality of spreadsheets (tables) is recorded, and then stored in an external storage device. A table designated by the user through mouse operation and the merged table are compared; if cells of the same data exist in a specific column, the data in rows to which said cells in the table belong are merged to rows to which relevant cells of the merged table belong; for rows to which cells existing only in the table belong, they are added as new row data to the merged table. Furthermore, a flag for identifying each table is recorded in rows merged or added to the merged table.

Abstract: The present invention is to provide a system capable of preventing an increase in load even if the amount of data increases. Upon receipt of a retrieval request, a main control part specifies, from a first customer table, row numbers adapted to the retrieval request. Then the main control part determines the range of data to be retrieved in a second customer table according to predetermined computational logic from the row numbers specified, the number of rows capable of being recorded in the first customer table for each customer, and the number of rows capable of being recorded in the second customer table for each customer.

Abstract: A data management system that facilitates table merges without the necessity of knowledge about a database or creating an environment therefore is provided.

Abstract: A data managing apparatus includes a data file storing records each including data units corresponding to predetermined items, and an index file corresponding to a certain item which requires data arrangement in a predetermined sequence and storing change bits each corresponding to one of the records stored in the data file and each representing whether data has been changed between the adjacent records with respect to the corresponding item. When a retrieval request is received from an operator about the foregoing certain item, the change bits are read from the index file following a retrieval start position and a retrieval direction designated by the retrieval request, so that a requested record is identified based on the read change bits. Then, data units of the identified record are read from the data file and notified to the operator via a display device or the like.

Abstract: A data management system is provided that manages sets in an orderly fashion.

Abstract: A set representation system is provided that enables the operator to immediately understand set manipulation instructions and calculation results of such instructions.

Abstract: In a data search system, a user interface is implemented which can present results of data search in a human-recognizable fashion. The data search system includes an image processing unit for displaying a data search result based on a certain search criterion, as a set per search criterion, as well as converting each set into a polygonal Venn diagram, e.g. a dodecagon, having an area corresponding in magnitude to the number of elements in each set. The system also includes a display control unit for causing each Venn diagram to be displayed on a predetermined display device. Each of the multiple Venn diagrams is displayed on the same display screen while keeping its relative relationship with other Venn diagrams based on their search criteria.