Abstract: Management device 100 includes reservation receiver 103 that receives reservation conditions including an identifier for identifying network appliance 10 that can be electrically controlled through a communication network and reservation time information indicating a time of controlling network appliance 10, that generates reservation information based on the reservation conditions, and that outputs address information for accessing a user screen corresponding to the reservation information that is generated; usability determiner 104 that determines usability of network appliance 10 based on the reservation information, when an instruction to operate network appliance 10 is issued from the user screen that is accessed by using the address information; and appliance controller 105 that controls network appliance 10 based on the instruction, in a case where the usability determiner determines that network appliance 10 is usable.