Abstract: A data conversion apparatus includes a plurality of computers connected to a network, a storage section, a retrieval section, data conversion processing sections, and a control section. The storage section stores plural sorts of information on the converter including a name of a computer equipped with a converter, a way of using the converter. A retrieval section retrieves information on the subject converter from the storage section according to a conversion request from a computer which requesting data conversion. The data conversion processing sections are connected to the respective computers and converts data into data of a format to be used with the converter on the basis of the result retrieved by the retrieval section. The control section controls the retrieval processing of the retrieval section and the conversion processing of the data conversion processing section to output converted data to the computer which requests data conversion.