Patent ID: 7472036

Claim:
A service providing system, comprising: an input section which receives a request of a user; an appliance operation control section which determines a response content in response to the request received at the input section; a presentation section which presents to the user the response content determined by the appliance operation control section; a biological signal detection section which measures an event-related potential of an electroencephalogram as a biological signal of the user; and a judgment section which judges presence or absence of a specific related-event potential after a predetermined period beginning at a starting point in the event-related potential measured by the biological signal detection section, the starting point being time when the presentation section presents the response content, wherein the judgment section includes: a judgment result storage section which stores a history of a judgment result; a judgment standard storage section which stores a plurality of judgment standards for judging presence or absence of the specific event-related potential according to number of occurrences of the specific event-related potential; and a user's state judgment section which obtains number of occurrences of the specific event-related potential by referring to the judgment result storage section, which selects one of the judgment standards in the judgment standard storage section according to the obtained number of occurrences, and which judges presence or absence of the specific event-related potential with use of the selected judgment standard, wherein the judgment standard storage section further stores at least one for-consecutiveness judgment standard for a case where the specific event-related potential occurs consecutively, and the user's state judgment section refers to the judgment result storage section, and when it has been judged that the specific event-related potential is present in the previous judgment, the user's state judgment section selects one of the for-consecutiveness judgment standard in the judgment standard storage section and judges presence or absence of the specific event-related potential with use of the selected for-consecutiveness judgment standard.