A judgment section (200) judges the presence or absence of a specific event-related potential in an event-related potential of user's (50) electroencephalogram measured by a biological signal detection section (101). A judgment standard storage section (203) stores a plurality of judgment standards according to the number of occurrences of the specific event-related potential. A user's state judging section (201) obtains the number of occurrences of the specific event-related potential by referring to a judgment result storage section (20) and selects any of the judgment standards in the judgment standard storage section (203) according to the obtained number of occurrences thereof for judgment.
Service providing system, service providing method, and program