Disclosed are a communication control device, etc. which can ensure the security of an information system without imposing any significant load. The communication control device 101 comprises: a first transmission unit 102 which, in response to a request from an information processing device 202 for identification information representing a relay device 203 for relaying communications, transmits identification information representing a second information processing device, which is different from the relay device 203, to the information processing device 202; and a second transmission unit 103 which transmits the identification information representing the relay device 203 to the information processing device 202 if software information about software that is to be transmitted by the information processing device 202 on the basis of the identification information is authorized software information.