Conversation-sentence generation device, conversation-sentence generation method, and conversation-sentence generation program

A conversation-sentence generation method that generates a conversation sentence of a virtual agent having a personified conversation with a user, comprising:

• receiving, as input information, a conversation sentence given from the user to the agent, and clue information based on which a physical and psychological state of the agent is estimated;
• storing the physical and psychological state of the agent as an agent state;
• estimating a new agent state based on the input information and the agent state;
• generating, based on the input information and the agent state, an utterance intention directed from the agent to the user;
• generating, based on the input information, the agent state, and the utterance intention, a conversation sentence given from the agent to the user;
• and
• outputting the generated conversation sentence.

A non-transitory computer-readable storage medium storing a program causing a computer to execute:

• a process that receives, as input information, a conversation sentence given from a user to an agent, and clue information based on which a physical and psychological state of the agent is estimated;
• a process that stores the physical and psychological state of the agent as an agent state;
• a process that estimates a new agent state based on the input information and the agent state;
• a process that generates, based on the input information and the agent state, an utterance intention directed from the agent to the user;
• a conversation sentence generating process that generates, based on the input information, the agent state, and the utterance intention, a conversation sentence given from the agent to the user;
• and
• a process that outputs the conversation sentence generated by the conversation sentence generating process.