This paper proposes a data augmentation technique using a diffusion model to solve the overfitting problem of deep learning models. Deep learning models require a large amount of labeled data, which causes overfitting and reduces the generalization ability to real environments. In this paper, we propose a method to augment existing datasets using a large dataset of a diffusion model that generates realistic images based on text inputs, and explore ways to improve the generalization performance of deep learning models across domains through various data augmentation strategies.