PURPOSE: To rapidly and highly sensitively identify a large image by collating an input image with a reference pattern stored in a reference pattern storage means.

CONSTITUTION: The tile device is provided with a first part image group evaluating means 110 for collating description stored in the reference pattern storage means 140 for storing the patterns of respective partial images constituting a reference pattern and the description of expression upon positions as elements with an input image in each partial image and outputting an evaluation value group relating to positions and an evaluation value group relating to the pattern. The input image is collated with the reference pattern stored in the storage means 140. Consequently, processing areas can be restricted only to collating areas 510, 520 and processing relating to these areas can be executed in parallel, so that the acceleration of the processing can be expected.