1. An apparatus for an integrated developing environment for a network application using various network processors, comprising: an application storing part configured to store an application produced by a user; an application attribute managing part configured to manage attribute information for the application, including input information, output information, and information regarding a connection between an input and an output; a target code creating part configured to compile the application, created on a first network application platform, stored in the application storing part based on the attribute information stored in the application attribute managing part and create a target code on a second and different target network application platform, wherein the target code corresponds to the compiled application created on the first network application platform, and wherein the target code creating part further includes: a packet frame creating unit configured to create a packet frame by using a packet processing description language for the application stored in the application storing part; and a target code converting unit configured to convert the packet frame created by the packet frame creating unit into the target code corresponding to hardware on the second and different target network application platform; and a code loading part configured to mount the target code created by the target code creating part in the hardware in the second and different target network application platform.