An event detecting apparatus, comprising: an image receiver configured to receive multiple captured images from multiple cameras (112, 114), which capture an area of the same location in different directions and have an overlapping region between images captured by the cameras; a rule receiver configured to receive from an individual rule generating apparatus an event rule for determining the presence or absence of a predetermined event from a synthesized image of the multiple captured images, and individual event rules which are generated by converting the event rule into individual event rules corresponding to coordinate systems corresponding to the multiple cameras (112, 114); an object-of-interest extractor configured to detect an object-of-interest in the multiple captured images and extract a plurality of trace information of the object-of-interest from the multiple captured images; an individual event determiner configured to determine whether the plurality of extracted trace information of the object-of-interest comply with the respective individual event rules; an event identifier configured to in response to the determining that the plurality of trace information meet the respective individual event rules, generate a plurality of inversely converted trace information by converting the plurality of extracted trace information of the object-of-interest into a coordinate system corresponding to the event rule, determine whether the plurality of inversely converted trace information comply with the event rule, and when the plurality of inversely converted trace information comply with the event rule, identify an occurrence of a single event; and an event output unit configured to generate output information according to the identified occurrence of the single event. an image receiver configured to receive multiple captured images from multiple cameras (112, 114), which capture an area of the same location in different directions and have an overlapping region between images captured by the cameras; a rule receiver configured to receive from an individual rule generating apparatus an event rule for determining the presence or absence of a predetermined event from a synthesized image of the multiple captured images, and individual event rules which are generated by converting the event rule into individual event rules corresponding to coordinate systems corresponding to the multiple cameras (112, 114); an object-of-interest extractor configured to detect an object-of-interest in the multiple captured images and extract a plurality of trace information of the object-of-interest from the multiple captured images; an individual event determiner configured to determine whether the plurality of extracted trace information of the object-of-interest comply with the respective individual event rules; an event identifier configured to in response to the determining that the plurality of trace information meet the respective individual event rules, generate a plurality of inversely converted trace information by converting the plurality of extracted trace information of the object-of-interest into a coordinate system corresponding to the event rule, determine whether the plurality of inversely converted trace information comply with the event rule, and when the plurality of inversely converted trace information comply with the event rule, identify an occurrence of a single event; and in response to the determining that the plurality of trace information meet the respective individual event rules, generate a plurality of inversely converted trace information by converting the plurality of extracted trace information of the object-of-interest into a coordinate system corresponding to the event rule, determine whether the plurality of inversely converted trace information comply with the event rule, and when the plurality of inversely converted trace information comply with the event rule, identify an occurrence of a single event; and an event output unit configured to generate output information according to the identified occurrence of the single event.