Abstract: An electronic cash register comprises a memory having a plurality of registering regions each allotted for each of the commodity departments, and a keyboard including numeral keys, whereby any of the registering regions of the memory are set to be utilizable by means of the keyboard. If and when a series of the commodity department codes are consecutive, the first commodity department code and the last commodity department code are entered by the keyboard, while the restricted number of digits of the unit prices being registerable is also entered. The registering regions corresponding to the respective commodity department codes between the first commodity department code and the last commodity department code are in succession designated by an address counter, and the restricted number of digits of the unit prices is loaded in the designated registering regions, whereby the series of the consecutive registering regions are set to be utilizable.