Computer-implemented method, search processing device, and non-transitory computer-readable storage medium

A search processing device comprising:

• a memory that stores inquiry data within a database, the inquiry data including a plurality of questions and related answers, each of the questions and answers including one or more words;
• and
• a processor coupled to the memory;
• wherein
• the inquiry data is divided into sentences to generate sentence data;
• wherein
• the sentence data is segmented to obtain word string data;
• wherein
• a plurality of content words is identified within with the word string data, the plurality of content words including a first word and a second word;
• and wherein
• the processor is configured to:
• receive an instruction from a user terminal, the instruction including at least one word string;
• select a first extended keyword from the database based on a first probability for each of the content words, the first probability indicating a probability of the first word being adjacent to the second word, the first extended keyword including a word string from the instruction and a first content word having a highest probability of being adjacent to the word string;
• extract a second extended keyword from the database based on the first probability for each of the content words, the second extended keyword having a second content word having a lower probability than the first content word of being adjacent to the word string;
• search the database based on a word string, first extended keyword and second extended keyword;
• and
• output candidate questions or answers from the inquiry data as search results obtained from the database.

A search processing device comprising:

• a memory that stores inquiry data within a database, the inquiry data including a plurality of questions and related answers, each of the questions and answers including one or more words;
• and
• a processor coupled to the memory, and the processor configured to:
• divide the inquiry data into sentences to generate sentence data;
• segment the sentence data to obtain word string data;
• identify a plurality of content words within with the word string data, the plurality of content words including a first word and a second word;
• count a number of times each of the plurality of content words are included within the word string data;
• calculate a first probability for each of the plurality of content words, the first probability indicating a probability of the first word being adjacent to the second word;
• wherein
• a first extended keyword and a second extended keyword are extracted from the database based on the first probability for each of the content words, the first extended keyword including a word string from the instruction and a first content word having a highest probability of being adjacent to the word string, the second extended keyword having a second content word having a lower probability than the first content word of being adjacent to the word string;
• and wherein
• searching the database is performed based on a word string, first extended keyword and second extended keyword.

A non-transitory computer-readable storage medium storing a search processing program that causes a computer to execute a process, the process comprising:

• accepting entry of a character string;
• identifying a first word from inquiry data including data about inquiries based on a probability at which the first word appears next to the character string in the inquiry data;
• extracting a plurality of inquiry collections each including one or a plurality of inquiries whose correct answer is the same question-and-answer data from the inquiry data;
• identifying a second word that appears in an inquiry collection different from an inquiry collection in which the first word appears among the plurality of inquiry collections based on ratios between a probability of appearance of the first word in a respective one of the plurality of inquiry collections and a probability of appearance of the second word in the respective one of the plurality of inquiry collections;
• and
• carrying out a search of a first data storing unit that stores question-and-answer data based on the character string, the first word, and the second word.