Design support device and design support system

A design support system comprising:

• a plurality of information processing devices used by each of a plurality of users;
• a virtual space creation unit configured to create image data of a three-dimensional virtual space simulating a site to be designed;
• a communication unit communicably connected to the plurality of information processing devices, configured to transmit the image data of the virtual space created by the virtual space creation unit to the plurality of information processing devices and receive information of a predetermined operation related to a design performed on the virtual space by each of the plurality of users in the user's own information processing device;
• and
• an object control unit having a function of creating an object simulating equipment to be designed in the virtual space, in a case where information on a creation operation of a predetermined object performed by a predetermined user included in the plurality of users in the virtual space is input via the communication unit, configured to create image data of the predetermined object and create attribute information of the predetermined object that can be referred to by other users to output the image data and the attribute information of the predetermined object to the plurality of information processing devices via the communication unit.