To execute integrated retrieval of the conventional data resources distributed on a network in real time.

A data resource retrieval system to retrieve data to be requested by a user from plural data resources 32-1 to 32-i to hold plural pieces of data classified into specified actual classifications is constituted. Control objects 34a to 34e corresponding to preset and specified virtual classifications Aa to Ee are provided in a retrieving server 30. Specified classification retrieving objects 38A to 38E to retrieve the data belonging to the virtual classifications Aa to Ee from the data held in the data resources 32-1 to 32-i upon receiving the retrieval requests from the control objects 34a to 34e are provided in each of the data resources 32-1 to 32-i.