PURPOSE: To fix easily a parameter and to obtain easily an attaining means for new command function produced in an information processor for parameter, by supplying the command parameter input not only through a terminal equipment but a parameter memory means.

CONSTITUTION: When the execution is indicated for the 2nd new command after the execution is through with the 1st existing command, a prescribed special mark is stored to a memory part 4 in place of a parameter in the 1st command as long as the 1st command contains a parameter specified previously, a parameter of fixed value, a parameter calculated in an information processor and a parameter supplied from a terminal equipment respectively. The modes of such stored parameters are programmed previously at a programming stage of the 2nd command. In case a parameter input request is given for execution of the 1st command during execution of the 2nd command, a parameter if stored in the part 4 is extracted. When no parameter is stored in the part 4, a parameter is sent to a command function attaining part 3 from the equipment 1. If the stored parameter is equal to a special mark, the command requests an input to the equipment 1.