data format

```javascript
let entire_news_lists = {
    'bbc' : {
        'tech': [],
        'sci': [],
        'business':[],
        'world':[],
    },
    'wsj':{
        'tech': [],
        'business':[],
        'world':[],
    },
    'naver':{
        'tech':[],
        'business':[],
        'world':[],
    },
}
```