A worker terminal, sending an operation command to robots (11a, 12a, 13a, 15a, 16a, 23) used in work, wherein the worker terminal comprises: a first sensor that detects a muscle potential of a worker (10a, 10b); a second sensor that detects a head movement of the worker (10a, 10b); a processing unit (230, 301, 401) that determines whether or not an operation instruction, defined by a combination of the head movement and change in the muscle potential, has been input by the worker (10a, 10b), on the basis of the detection results of the first sensor and the second sensor; and a communications unit (235, 303, 403) that sends the operation command to the robots (11a, 12a, 13a, 15a, 16a, 23) if a determination has been made that the operation instruction has been input by the worker (10a, 10b); the worker terminal being characterized in further comprising: a prompt unit (36, 46) that prompts the change in the muscle potential sensed by the first sensor and the head movement sensed by the second sensor to the worker (10a, 10b), wherein when the change in the muscle potential satisfies a first condition and the head movement satisfies a second condition, the processing unit (230, 301, 401) judges that the operation instruction has been input, and the prompt unit (36, 46) prompts the first condition and the second condition to the worker (10a, 10b), wherein within a specified limit time after the muscle potential satisfies the first condition, the processing unit (230, 301, 401) judges that the operation instruction has been input when the head movement satisfies the second condition, and when the muscle potential satisfies the first condition, the prompt unit (36, 46) further prompts a countdown of the limit time for inputting the head movement. a first sensor that detects a muscle potential of a worker (10a, 10b); a second sensor that detects a head movement of the worker (10a, 10b); a processing unit (230, 301, 401) that determines whether or not an operation instruction, defined by a combination of the head movement and change in the muscle potential, has been input by the worker (10a, 10b), on the basis of the detection results of the first sensor and the second sensor; and a communications unit (235, 303, 403) that sends the operation command to the robots (11a, 12a, 13a, 15a, 16a, 23) if a determination has been made that the operation instruction has been input by the worker (10a, 10b); the worker terminal being characterized in further comprising: a prompt unit (36, 46) that prompts the change in the muscle potential sensed by the first sensor and the head movement sensed by the second sensor to the worker (10a, 10b), wherein when the change in the muscle potential satisfies a first condition and the head movement satisfies a second condition, the processing unit (230, 301, 401) judges that the operation instruction has been input, and the prompt unit (36, 46) prompts the first condition and the second condition to the worker (10a, 10b), wherein within a specified limit time after the muscle potential satisfies the first condition, the processing unit (230, 301, 401) judges that the operation instruction has been input when the head movement satisfies the second condition, and when the muscle potential satisfies the first condition, the prompt unit (36, 46) further prompts a countdown of the limit time for inputting the head movement. a prompt unit (36, 46) that prompts the change in the muscle potential sensed by the first sensor and the head movement sensed by the second sensor to the worker (10a, 10b), wherein when the change in the muscle potential satisfies a first condition and the head movement satisfies a second condition, the processing unit (230, 301, 401) judges that the operation instruction has been input, and the prompt unit (36, 46) prompts the first condition and the second condition to the worker (10a, 10b), wherein within a specified limit time after the muscle potential satisfies the first condition, the processing unit (230, 301, 401) judges that the operation instruction has been input when the head movement satisfies the second condition, and when the muscle potential satisfies the first condition, the prompt unit (36, 46) further prompts a countdown of the limit time for inputting the head movement.