Abstract: An information collecting device includes: a network interface unit which receives information on consumables from a plurality of devices connected through a network; a database access unit which accesses a database storing the information on consumables of each of the devices; and a control unit which controls the network interface unit and the database access unit. The information on consumables contains a device ID assigned to each of the devices and the consumption number of consumables as the number of consumables consumed by each of the devices. From the database, the database access unit acquires a value of a device ID field used to store the device ID, a value of a previous quantity field used to store the consumption number of consumables received at previous time, and a value of a total number field used to store the total number of consumables consumed by each of the devices.

Abstract: A database access server that performs processing for making access to a database is provided.

Abstract: An ID issuing system that issues an ID in response to a request from a client includes: a plurality of ID issuing servers that execute issuance of the ID; and a history management device that manages the ID, which is issued by each of the plurality of ID issuing servers, by a history table. Either an issued state or a reserved state, which is a reserved but non-issued state, is registered as a status of an issuance history of the ID in the history table.