A terminal which performs a word recommendation method, the terminal comprising:
- a communication module;
- a memory;
- a display unit;
- and
- a processor,
- wherein the processor receives recommended word information from a server through the communication module, the recommended word information includes word information that a user is predicted not to know in an AI (Artificial Intelligence) model based on training data of the user, and the processor allows the display unit to display a first window including the word information based on the recommended word information, to receive operation of dragging the first window from the user, and to display an icon representing whether to add the word information to a vocabulary list included in the memory based on a direction of the dragging operation, and includes the word information in the vocabulary list based on the direction of the dragging operation,
- wherein the AI model includes (1) a user embedding model for generating an embedding vector of the user, (2) a word embedding model for generating an embedding vector of a word related to the word information, and (3) an arbitrary similarity scoring function of determining similarity between the user embedding vector acquired from the user embedding model and the word embedding vector acquired from the word embedding model,
- wherein the server inputs (1) the user embedding vector and (2) the word embedding vector to the arbitrary similarity scoring function, outputs a result value for predicting whether the user knows a word related to the word vector from the arbitrary similarity scoring function,
- wherein the recommended word information is generated in the server based on the result value, and
- wherein the processor:
- displays a word, a first button and a second button on the terminal,
- based on the first button being selected by the user, marking the word displayed on the terminal as “0” indicating that the user knows the word displayed on the terminal,
- based on the second button being selected by the user, marks the word displayed on the terminal as “1” indicating that the user does not know the word displayed on the terminal,
- based on the word displayed on the terminal being marked as “0”, displays meaning of the word displayed on the terminal, a third button and a fourth button on the terminal,
- based on the third button being selected by the user, maintains a marking “0” indicating that the user knows the word displayed on the terminal, and
- based on the fourth button being selected by the user, changes the marking “0” to “1” indicating that the user does not know the word displayed on the terminal.