Provided are a device control apparatus, a device control method, and a device control system which prevent a conflict from occurring in RPCs simultaneously transmitted from a plurality of applications to the same device, so that RPCs can be applied to exercise control over devices in an IoT system of a many-to-many connection which cannot accept non-completion of a series of processing operations in cooperation. The device control apparatus includes a memory (13h) in which information on a device (30) and an identifier of the device (30) is stored, and a memory (13i) in which authority of the device 30 for each application (20) is stored. The device control apparatus includes a memory (13h) configured to store information on a device (30) and an identifier of the device (30), and a memory (13i) configured to store authority for controlling the device 30 for each application (20). The apparatus, the method, and the system provide, in accordance with a request signal from, e.g., an application (20a) control authority to the application (20a), if the application (20a) has control authority for all devices (30) as a control object, and transmit a remote control signal from the application (20a) to devices (30a, 30b) as a control object while excluding a control authority for other applications (20b, 20c) to control the devices (30).