According to the present invention, disclosed is a brain-computer interface apparatus which does not have decreased classification performance even if the brain-computer interface apparatus is not in use for a long period of time. The brain-computer interface apparatus comprises: a memory in which a brain signal-based control program is stored; and a processor for performing at least one among updating a filtering frequency band, adjusting a common space filter, and adjusting a brain signal classifier based on a difference between test data of a user received at regular intervals while determining whether an intention of the user is any one of a plurality of motions by filtering brain signal data of the user received in real time by executing the program stored in the memory with a preset filtering frequency band, extracting a feature vector from the filtered data by applying the common space filter, and inputting the extracted feature vector to a previously learned brain signal classifier.
- BRAIN-COMPUTER INTERFACE APPARATUS ADAPTABLE TO USE ENVIRONMENT AND METHOD OF OPERATING THEREOF