A communication device 100 transmits, to an LwM2M server 400, data specified by the Read command, in response to receiving a Read command from the LwM2M server 400. The communication device 100 transmits, to the LwM2M server 400, an Update message for extending a lifetime indicating a period in which communication between the communication device 100 and the LwM2M server 400 is enabled. In a case where there is transmission data from the communication device 100 to the LwM2M server 400, the communication device 100 transmits the Update message including read request information for requesting the LwM2M server 400 to read the transmission data.