Interaction server

1. An interaction server that holds an interaction by responding to an input made by a user such that the user is urged to make an additional input and by providing response content according to the input of the user, the interaction server comprising:

processing circuitry; and

a memory configured to store

a truth table that associates response content including a sentence to be provided to the user with a plurality of searching keywords, and

a relational table that includes a plurality of related keywords associated with each other;

wherein the processing circuitry

receives an input of an input keyword from the user,

automatically refers to the relational table and acquires a related keyword of a word that matches the input keyword, from the relational table,

performs searching in the truth table, and acquires response content corresponding to the related keyword, and

transmits the response content to the user,

wherein the processing circuitry acquires the input keyword on the basis of an input sentence received from the user,

wherein the processing circuitry is configured to make a determination to perform searching based on determining whether searching including any of the plurality of related keywords or searching including none of the plurality of related keywords by performing natural language analysis on the input sentence, the natural language analysis being trained via machine learning based on sentence examples of affirmative sentences and negative sentences.

2. The interaction server according to claim 1 ,

wherein the truth table further associates related contents related to the response contents,

wherein when a plurality of response contents are acquired, in a case in which related contents mapped to the plurality of acquired response contents are the same, the processing circuitry acquires response content corresponding to at least one related keyword, and

wherein the processing circuitry transmits the response content.

3. The interaction server according to claim 2 ,

wherein when a plurality of response contents are acquired, in a case in which related contents mapped to the plurality of acquired response contents are different, the processing circuitry acquires one related keyword of the plurality of related keywords, and

wherein the processing circuitry transmits the one related keyword as a return question key for urging the user to make an additional input.

4. The interaction server according to claim 1 ,

wherein when the input keyword does not coincide with any searching keyword in the truth table and coincides with a related keyword in the relational table, the processing circuitry acquires response content corresponding to a different related keyword associated with the related keyword in the relational table from the truth table.

5. The interaction server according to claim 1 ,

wherein the relational table causes one main keyword to be associated with the plurality of related keywords related to each other.

6. The interaction server according to claim 2 ,

wherein the processing circuitry acquires the input keyword on the basis of an input sentence received from the user,

wherein the processing circuitry is configured to perform searching based on determining determine whether searching including any of the plurality of related keywords is performed or searching including none of the plurality of related keywords is performed by analyzing the input sentence.

7. The interaction server according to claim 3 ,

wherein the processing circuitry acquires the input keyword on the basis of an input sentence received from the user,

wherein the processing circuitry is configured to perform searching based on determining determine whether searching including any of the plurality of related keywords is performed or searching including none of the plurality of related keywords is performed by analyzing the input sentence.

8. A method, implemented by an interaction server that holds an interaction by responding to an input made by a user such that the user is urged to make an additional input and by providing response content according to the input of the user, the method comprising:

storing, in a memory, a truth table that associates response content including a sentence to be provided to the user with a plurality of searching keywords, and

storing, in the memory, a relational table that includes a plurality of related keywords associated with each other;

performing, by processing circuitry,

receiving an input of an input keyword from the user;

automatically referring to the relational table and acquires a related keyword of a word that matches the input keyword, from the relational table

performing searching in the truth table, and acquiring response content corresponding to the related keyword; and

transmitting the response content to the user,

wherein the method further includes acquiring the input keyword on the basis of an input sentence received from the user, and

making a determination to perform searching based on determining whether searching including any of the plurality of related keywords or searching including none of the plurality of related keywords by performing natural language analysis on the input sentence, the natural language analysis being trained via machine learning based on sentence examples of affirmative sentences and negative sentences.