To provide new password preparation technology to prepare a password whose intensity is ensured.

Under the consideration that the intensity of a password is made to correspond to the generation order of password candidates generated by a password presuming tool used for brute force attack, a user is made to input the intensity of the password, the generation order corresponding to the inputted intensity of the password is acquired, and a password is prepared by the password presuming tool on the basis of the result. Thus, it is possible to prepare a password whose intensity, that is, whose resistance to the brute force attack is guaranteed in two years, for example. Therefore, it is possible for a user to use the password without any anxiety.

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