To provide an inventory management server, an inventory management system, an inventory management program, and an inventory management method which are capable of carrying out inventory management such as warehousing processing and delivery processing easily and inexpensively by using an image for identifying merchandise together with an image of the merchandise. Provided is an inventory management server 4 for carrying out inventory management using images of merchandise, the inventory management server 4 including: a warehousing data acquisition unit 61 which acquires warehousing data from a user terminal, the warehousing data including a merchandise basic image obtained by photographing merchandise to be warehoused, an identification information image obtained by photographing identification information on the merchandise, a warehoused quantity of the merchandise, and a warehousing date of the merchandise; and an inventory data storage unit 52 which stores the identification information image and the warehoused quantity and warehousing date of the merchandise as inventory data in association with the acquired merchandise basic image.
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