Electronic apparatus and server for refining artificial intelligence model, and method of refining artificial intelligence model

An electronic apparatus configured to refine an artificial intelligence (AI) model, the electronic apparatus comprising:

• a memory storing a local model;
• at least one processor configured to:
• detect a change of information about a context of the electronic apparatus determined as a relay apparatus among electronic apparatuses classified as a group by being determined as the electronic apparatuses belong to the same user, wherein the information about the context being a basis for refining a first local model stored in the electronic apparatus comprises personal information including a behavior pattern of a user of the electronic apparatus, and determine a first gradient for refining the first local model based on difference the change of the information about the context;
• and
• a communicator comprising communication circuitry configured to:
• in response to detecting the change of information about the context of the electronic apparatus, receive a second gradient from at least one of the other electronic apparatuses included in the group, used to refine a second local model stored on at least one of the other electronic apparatuses,
• transmit the first gradient and the received second gradient to a server having a global model, and receive, from the server, information about the global model refined based on the first gradient and received second gradient,
• wherein the at least one processor is further configured to refine the first local model based on the first gradient and the received second gradient if a state of the electronic apparatus satisfies a predetermined condition and refine the refined first local model based on the received information about the refined global model.