Provided is a device control system including: a device, which has a device ID for identifying the device, and is configured to write a user ID for identifying a user in a memory based on an instruction to register the user ID; and a server configured to transmit a message containing the user ID and a command to the device having the device ID. The device is configured to: receive the message, and compare the user ID contained in the message and the written user ID; and determine whether the command contained in the message is executable in accordance with a result of the comparison.