1. A work machine provided with a device configured to execute processing, the work machine comprising: a communication terminal device configured to, when the communication terminal device has received a request command for causing the device to execute processing from a command source outside the work machine, return notification of reception completion to the command source, and output the request command to the device that executes processing corresponding to the request command, and transmit processing completion notification indicating the processing has been completed to the command source when the device that executes processing corresponding to the request command executed the processing.