Encoding device, encoding method and search method

An encoding device comprising:

• a processor that:
• generates a plurality of word codes by assigning a compression code to each of a plurality of words contained in a sentence in a compression target document;
• generates a plurality of pieces of semantic structure information respectively corresponding to the plurality of words by performing a semantic analysis of the sentence;
• and
• generates a plurality of semantic structure codes by assigning each of the plurality of a compression codes to corresponding semantic structure information;
• and
• outputting the plurality of word codes and the plurality of semantic structure codes with a specific order.

An encoding method performed by a computer, the method comprising:

• first generating, by a processor, a plurality of word codes by assigning a compression code to each of a plurality of words contained in a sentence in a compression target document;
• second generating, by the processor, a plurality of pieces of semantic structure information respectively corresponding to the plurality of words by performing a semantic analysis of the sentence;
• and
• third generating, by the processor, a plurality of semantic structure codes by assigning each of the plurality of compression codes to corresponding semantic structure information;
• and
• outputting the plurality of word codes and the plurality of semantic structure codes with a specific order.