1. A weight measurement apparatus comprising: a load detection unit configured to detect a load to a loading unit; a storage unit configured to store a zero point in advance; a control unit configured to calculate a load calculation value using a load signal corresponding to the load to the loading unit, based on an output of the load detection unit; and a display unit configured to display the load calculation value, wherein the control unit calculates a loading state load calculation value as a load calculation value which is calculated based on a load signal in a loading state and the zero point of the storage unit, in the loading state where a load is applied to the loading unit, and calculates a non-loading state load calculation value as a load calculation value which is calculated based on load signals in the loading state and in a non-loading state, and displaying the non-loading state load calculation value on the display unit, after the loading state, and in the non-loading state where the load is removed from the loading unit.