A technology of providing a function of increasing a frequency of changing authentication information when starting up a machine irrespective of whether a user is aware of it, is disclosed. A processing machine having an operating state and a stopping state comprises a control unit (2, 8) making a request for inputting the predetermined authentication information at a transition from the stopping state to the operating state, and restraining this transition if the authentication information is not inputted, and an authentication setting unit (2, 8) confirming an intention for executing a process of changing the authentication information when executing a predetermined process.