System and method for providing voice assistant service

A device for providing a voice assistant service, the device comprising:

• a microphone configured to receive a user voice input;
• a communication interface;
• a memory storing one or more instructions;
• and
• at least one processor configured to execute the one or more instructions to:
• receive, from an external device through the communication interface, a character specialized model to interoperate with a voice assistant program,
• receive, through the microphone, the user voice input comprising a request for a response of the voice assistant program and a word indicating a character corresponding to the character specialized model,
• generate a response message to the request for the response of the voice assistant program, using the character specialized model interoperating with the voice assistant program, and
• output the generated response message.

A server for providing a voice assistant service, the server comprising:

• a communication interface;
• a memory storing one or more instructions;
• and
• at least one processor configured to execute the one or more instructions to obtain, through the communication interface, a character specialized model to interoperate with a voice assistant program of a device, to, based on a user voice input comprising a request for a response of the voice assistant program and a word indicating a character corresponding to the character specialized model, generate a response message to the request for the response of the voice assistant program.