To perform the registration and collation even to a user who may possibly be rejected by changing a collation method according to the evaluation value of dictionary data contained in the registered data which are read out of a storage means when the dictionary data are collated with collating organismic data.

An input biological data buffer 241 temporarily stores input collating organismic data and then, inputs the stored organismic data to an input data evaluation part 244. If the evaluation result of the part 244 is smaller than a prescribed threshold, the organismic data are judged as the ineffective data. Meanwhile, the orgnismic data are outputted to a data collation part 245 as the effective data if the organismic data are larger than the prescribed threshold. The part 245 collates the inputted organismic data with the dictionary data stored in a dictionary data buffer 243 and the numerical value of this collation result is compared with the prescribed threshold by a collation result decision part 246. Based on the comparison result obtained by the part 246, the number of collation times is changed.