1. A device which extracts an abnormal event from medical information comprising: an abnormality score calculating unit which calculates an abnormality score which is information indicating abnormality of medical data, based on specificity of the medical data; an abnormality score vector generating unit which creates at least one or more abnormality score vectors which are information obtained by integrating the abnormality score; and a side effect detecting unit which decides a likelihood of a side effect indicated by the abnormality score vector, based on a predetermined rule, and detects an abnormality score vector the likelihood of which satisfies a condition set in advance as information indicating the side effect.