To provide an information processor which can reduce complication for the management of maintaining security and can maintain the security level of a server.

A communication protocol is used for the information processor 1 and a management device 2 is connected. The manager of the information processor 1 inputs a master password to the information processor 1 from a user interface. When the information processor 1 receives the master password, the master password is registered in a nonvolatile memory. It is informed to all server tasks on the information processor 1 that the master passwords are registered by using the intertask communication of a message queue or the like. The server task generates the password which the server task uses. The password is registered to a server 3.