| Research Agency | Rakuten Research, Inc. |
| Research Method | Internet |
| Delivery Destination | Japan |
| Date | From 24th April to 28th April, 2015 |
| Age | People in their thirties and forties |
| Essential Requisite | The people who know all brands of study. |
| Household Income is more than 10 million yen or household assets (financial assets and real estate) is more than 50 million yen | |
| Elimination Condition | The people who chose the same choices at more than 90% questions |
| The people who finished the survey less than 80% speed than average speed. | |
| All Mail Sender | 7822 samples (men 5032 samples, women 2790 samples) |
| Finally Collected Samples | 500 samples (men 250 samples, women 250 samples) |