A commodity sales data processing apparatus, including a portable information terminal having a battery and a display on which an executable job name is displayed and a docking station on which the information terminal is mounted to charge the battery, monitors whether or not the information terminal is mounted on the docking station to detect the separation therebetween. The processing apparatus restricts jobs permitted at the time the information terminal is separated from the docking station to a part of jobs permitted at the time the information terminal is mounted on the docking station if the separation between the information terminal and the docking station is detected and the display of the information terminal displays job names permitted at the time the information terminal is separated from the docking station if the separation between the information terminal and the docking station is detected.