To update identical data in all of a plurality of tables when another identical data is updated in one of a plurality of tables including the identical data, to automatically perform sorting matching the updated contents, and to automatically store the data in the stored tables.
A data table including a field value to be actually displayed and the sorted tables previously sorted and referring to the field value in the data table are managed. When a user carries out change operation in the displayed table (S202, YES) while the sorted tables are displayed (S201), the changed contents are inputted (S203). The field value is updated (S204) according to the changed contents. Resorting of all the sorted tables referring to the updated field value is carried out (S205). On the basis of the new sorted tables obtained by resorting, the old sorted tables are updated (S206). The sorted tables displayed currently are updated and re-displayed (S207) according to data updating and a sort execution result.
KAMIMURA SHUICHI
FUJIWARA MUTSUMI
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