Table 1. Major keywords related to forest therapy in official websites and original articles.
| Official Website | Keywords in Original Articles |
| Words | Fre. | ‰ | Words | Fre. | ‰ |
| Sound | 6 | 44.4 | therapy Program | 9 | 62.9 |
| Phytoncide | 5 | 37.0 | Stress | 7 | 49.0 |
| Depression | 5 | 37.0 | Health | 5 | 35.0 |
| Scene | 4 | 29.6 | Forest activity | 3 | 21.0 |
| Immunity | 4 | 29.6 | Attention | 3 | 21.0 |
| Health | 4 | 29.6 | Natural Healing | 3 | 21.0 |
| Oxygen | 4 | 29.6 | Heart Variability | 3 | 21.0 |
| Anion | 3 | 22.2 | Anion | 3 | 21.0 |
| Fatigue | 3 | 22.2 | Self-Esteem | 3 | 21.0 |
| Plants | 3 | 22.2 | Forest Recreation | 3 | 21.0 |