Data retrieval apparatus, program and recording medium

A program causing a computer to function as a data retrieval apparatus that retrieves data from two or more databases that return retrieved data in response to a retrieval instruction, the program causing the computer to function as:

• a data dictionary including presentation structure definition information for assisting input of a user terminal to issue a retrieval request compliant with a retrieval requirement, virtual data structure definition information for analyzing the retrieval request and converting the retrieval request into a retrieval instruction expressed as physical information processable by the database, and retrieval request definition information for managing relevance between different retrieval requests;
• a business intelligence circuit for assisting input of the user terminal according to the presentation structure defined in the data dictionary to issue a retrieval request described according to the presentation structure, and outputting a retrieval result based on the virtual data structure, the retrieval result being obtained by executing the retrieval request by a virtual database, to the user terminal;
• and
• a virtual database for analyzing the retrieval request according to the virtual data structure defined in the data dictionary to generate a retrieval instruction, executing the generated retrieval instruction in the database to acquire two or more retrieved data, and integrating the acquired two or more retrieved data to prepare a retrieval result responding to the retrieval request,
• wherein the data retrieval apparatus associates a plurality of retrieval results prepared in response to different retrieval requests with each other by the retrieval request definition information.