PURPOSE: To start operation without a key switch and to prevent a program from being copied and forged by providing a first memory, a second memory, an input means and a display means in a main body and providing a control part freely attachably and detachably.

CONSTITUTION: This processor is provided with a first memory 13 to store a program, a second memory 14 to store registration data and so on, an input means 2, a display means 3 and a control part 11 to make the second memory 14 store the registration data and so on based on the program stored in the first memory 13 when the data are inputted from the input means 2. Then, the first memory 13, the second memory 14, the input means 2 and the display means 3 are provided in a main body and the control part 11 is provided freely attachably and detachably to the main body. Accordingly, since any action mode becomes impossible to be executed when the control part 11 is detached from the maon body, security can be attained.