A purchase management apparatus notifies a target user having purchased a first item about next purchase timing. The apparatus can refer to a purchase history DB associating user ID and purchase history records, and an item DB associating item ID and category ID. The apparatus acquires user ID of a target user from the purchase history DB, specifies a category using the category ID of the category to which the first item belongs, calculates a purchase interval of the items belonging to the category based on the purchase history record specified using the target user ID among the purchase history records of the items belonging to the category, and estimates a purchase interval of the first item based on the calculated purchase interval. The purchase interval of the first item with no purchase history can be thereby estimated based on the known purchase history.
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