| 摘要 |
A catalog control portion invokes a catalog input/output portion, and develops data of a catalog data file to a catalog data area via a catalog data management portion, wherein the catalog data area comprises a catalog pool for storing each pool data and a pool management table for managing each catalog pool by its pool number. Also included is a data table which stores the pool number and the pool data of the catalog to be currently executed. During execution, the catalog control portion sets the pool number, pool data and the like to reference to the pool number of the data table prior to access to the catalog data to determine a catalog pool which is the current target from the pool management. Therefore, when in the interactive processing, nesting of the catalog is controlled, and it is possible to achieve control of a general-purpose catalog by a simple program structure to improve catalog storage or maintenance efficiency and memory utilization efficiency.
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