1. An information retrieving apparatus, comprising: inputting means for inputting a retrieval request described in a first data format; generating means for generating retrieval information described in a second data format based on the retrieval request described in the first data format; retrieving means for retrieving data described in the second data format based on the retrieval information described in the second data format; conversion means for converting the retrieved results from the second data format into the first data format; and evaluating means for evaluating the retrieved results converted into the first data format based on the retrieval request described in the first data format.