Provided are a device and method for executing a kernel application program interface (API) interactively in a Linux system, wherein a kernel API is independently operated in a user region to confirm an operation result. The device includes: a device interface unit for receiving a command from a user, and outputting an execution result corresponding to the command to the user; a kernel API command analysis unit for receiving the command from the device interface unit, analyzing the command, and generating kernel API execution information; and a kernel API command execution unit for executing a kernel API corresponding to the command using the kernel API execution information, and transmitting the execution result to the device interface unit. Thus, a kernel API can be applied using a simple process with reduced time and effort, instead of repeating the entire kernel program development process for a Linux system.