A three-dimensional model providing apparatus in which a customer can easily modify the input three-dimensional data. The apparatus comprises an input section (10) for inputting three-dimensional data, a server section (12) for managing the processes on the three-dimensional data from input to output, a providing section (14) for providing three-dimensional data, a communicating section for communicating the three-dimensional data between the input section, server section, and providing section, a receiving section (11) for receiving instruction contents from the customer, and a converting section (13) for modifying, processing, or converting the three-dimensional data according to the instruction contents.