To perform high-speed collation in the case of both a low resolution and a high resolution at the certification time.

This device has a recording device for registering organism pattern information with a first resolution, an information reading device for acquiring the organism pattern information with the first resolution or a second resolution having a lower resolution than the first resolution, a resolution lowering part 203 for changing the organism pattern information with the first resolution registered in the recording device into the organism pattern information with the second resolution, a collating means 204 for collating the organism pattern information acquired by the information reading device with the organism pattern information with the first resolution from the recording device or the organism pattern information with the second resolution from the resolution lowering part, and a switching means 205 for inputting into the collating means the organism pattern information with the first resolution from the recording device or the organism pattern information with the second resolution from the resolution lowering part corresponding to the resolution of the organism pattern information acquired by the information reading device.