The present invention relates to a system for registering a game item sale and a method thereof, in which location of item data is moved to a sales storage area of a predetermined inventory allocated to an operation character and registration with respect to a corresponding game item for sale is enabled to be performed. There is provided a system for registering a game item sale, comprising: an inventory maintaining at least one storage area for storing item data with respect to a game item held by an operation character; an area defining means defining at least one portion of the storage area as a sales storage area; a transaction register linking the sales storage area to a sale field of a predetermined exchange database and in response to location movement of the item data to the sales storage area, controlling the game item to be recorded in the sale field of the exchange database; and an operation control means controlling a predetermined effect to be added to the operation character in accordance with the location movement of the item data; wherein the effect is display information on the location movement of the item data.