In a person retrieval apparatus, a plurality of extraction processing sections each extract personal biometric information from images taken by a plurality of cameras. A quality determination section determines a quality of each piece of biometric information extracted by the extraction processing sections. A reliability level setting section sets a reliability level to each piece of biometric information on the basis of the quality determined by the quality determination section. The biometric information extracted by the extraction processing sections and the reliability level set by the reliability level setting section are stored in a memory. In this state, in the person retrieval apparatus, the face retrieval section performs person retrieval processing on each piece of biometric information stored in the memory in descending order of the reliability level corresponding to each piece of biometric information.