Patent ID: 8064651

Claim:
A person identification device which identifies a person, comprising: a storage unit in which at least one piece of biometric information of a registrant and attribute information indicating attributes of registrants that are associated with each other are stored; an information obtaining unit which obtains information obtained by monitoring at least one monitoring area; a detection unit which detects biometric information of at least one person from the information obtained by the information obtaining unit; an identification unit which collates the biometric information detected by the detection unit with the biometric information stored in the storage unit to identify the person associated with the detected biometric information; a group judgment unit which judges whether or not a plurality of persons having attributes set in advance are present at the same time in a specified area based on the information obtained by the information obtaining unit and an identification result obtained by the identification unit from the biometric information detected by the detection unit; and an output unit which outputs a warning having information and a level set in advance to an external device, if the group judgment unit judges that the plurality of persons are present at the same time in the specified area, wherein, when the group judgment unit judges that the plurality of persons have the attribute of a single group, the warning information and level to be output from the output unit are changed in accordance with the attribute of the group and the number of the persons.