A protection method of application software is executed by initiating the first program transmitted from a server via a network on a client, and the method divides an execution result of the application software executed on the client into a plurality of pieces of intermediate data in accordance with distribution arrangement information reported by the server, distributes and arranges the plurality of pieces of intermediate data in the server and the client, transmits to the server notice information including a data length and arranged location information of each piece of the distributed and arranged plurality of pieces of intermediate data, rearranges the distributed and arranged plurality of pieces of intermediate data in the original order of the execution result of the application software on the basis of the notice information, generates in the server a second program for generating the execution result, and transmits the second program to the client.