An option which is considered to be desired by a user is determined by using an electroencephalogram interface (IF), and a determination error for the option is detected based on an electroencephalogram. If a determination error is detected, the option is corrected based on the electroencephalogram information which was used for the option determination.A correction apparatus to be incorporated in an electroencephalogram IF system is provided. The electroencephalogram IF system includes a biological signal measurement section, an analysis section for analyzing an event-related potential contained in an electroencephalogram signal of a user, an inference section for inferring an option desired by the user based on a result of analysis, and an output section for presenting the option inferred by the inference section to the user. The biological signal measurement section measures the electroencephalogram signal of the user based on a point of presenting the option to the user as a starting point. The correction apparatus includes: a determination section for determining correctness of the inferred option based on an event-related potential contained in an electroencephalogram signal acquired after inference of the option； and a correction section for, when the inferred option is determined to be incorrect, correcting the inferred option based on the event-related potential before inference of the option and designating a device operation based on the option after correction.
