Patent ID: 7837103

Claim:
A method for selling an item to be sold by weight executed in a system having a control apparatus set on each item-selling space, an accounting apparatus set on a check-out space and using a tray having a recording unit from which data is read and in which data is written, the method comprising: a step for a first weight-measuring device included in the control apparatus of measuring a weight of an item displayed for sale in an item-selling space; a step for the control apparatus of holding the weight measured by the first weight-measuring device, detecting whether the measured weight of the displayed item is changed from the weight held prior to the measuring, holding the weight difference between the measured weight and the held weight, and presenting a notice of measuring a tray; a step for a second weight-measuring device included in the control apparatus of measuring a weight of a tray on which the item placed within a package is placed when the notice is presented; a step for the control apparatus of calculating a weight of the item placed within the package on the tray based on predetermined weights of the package and the tray, determining whether the weight of the item placed within the package equals the weight difference, calculating a sales price of the item placed within the package based on the measured weight of the item placed within the package and a predetermined unit price of the item, writing the measured weight and the calculated sales price in the recording unit of the tray holding the package; a step for a third weight-measuring device included in the accounting apparatus of measuring a weight of the tray holding the package; a step for the accounting apparatus of calculating a weight of the item placed within the package based on the predetermined weights of the package and the tray, reading the weight from the recording unit, determining whether the measured weight of the item placed within the package equals the read weight, reading the sales price from the recording unit, and checking out the item on the tray according to the read sales price.