Non-transitory computer-readable recording medium, retrieval method, and retrieval device

A retrieval method comprising:

• dividing a set of structured documents related to external knowledge into a plurality of pieces of partial data for each predetermined unit;
• generating a prompt including the pieces of partial data, designated input data, and an instruction to select the partial data relevant to the input data;
• inputting the prompt to a large language model, to acquiring a selection result of the large language model;
• and
• retrieving one piece of partial data from the pieces of partial data, based on the selection result, and outputting a retrieval result, by using a processor.

A retrieval device comprising:

• a memory;
• and
• a processor coupled to the memory and configured to:
• divide a set of structured documents related to external knowledge into a plurality of pieces of partial data for each predetermined unit;
• generate a prompt including the pieces of partial data, designated input data, and an instruction to select the partial data relevant to the input data;
• input the prompt to a large language model, to acquiring a selection result of the large language model;
• retrieve one piece of partial data from the pieces of partial data, based on the selection result;
• and
• output a retrieval result.