Rental system of working machine

A rental system of a working machine comprising:

• a customer terminal;
• a rental management server;
• a maker management server;
• and
• a network communicatively connected with the customer terminal, the rental management server, and the maker management server, wherein
• the customer terminal submits to the rental management server via the network, rental information including first specifying information of at least one of working machine which is requested for rental by a customer,
• the rental management server includes
• a rental processor to extract the first specifying information of the at least one of working machine from the rental information, and
• a rental communicator to transmit the extracted first specifying information to the maker management server via the network, and
• the maker management server includes
• a maker storage to store second specifying information of at least one of working machine which is manufactured and/or sold by a manufacturer, and
• an issuing processor to issue a rental permission of the at least one of working machine when determining that the first specifying information received from the rental management server is matched with the second specifying information stored in the maker storage of the maker management server, by transmitting a permission command indicating that the rental of the at least one of working machine is permitted, along with the first specifying information thereof, to the maker management server.