A push installation system including a server and clients connected via a network, the server installing a device driver on one or more clients via the network, is provided. The server includes an acquisition unit for acquiring, via the network, an operating state of each of the clients connected to the network; a determination unit for determining whether or not each of the clients is in a ready-for-installation state, in which installation can be performed, based on the operating state of each of the clients acquired by the acquisition unit; and an installation unit for performing processing, via the network, for installing or updating the device driver on at least one client that is determined to be in the ready-for-installation state.