I heard before, that max size of localStorage is 5bm to one domain name, but it's too small for me. Can i increase size if localStorage? I should notice that my app work on just one device - it's a terminal, with chromium.
The value of 5MB is not always true. The local storage size varies from browser to browser (2.5 MB per origin in Google Chrome; 5 MB per origin in Mozilla Firefox, and Opera; 10 MB per storage area in Internet Explorer).
You can get more info about local storage for each browser here. You can also test your browser's local storage here.
If you have a lot of data to store and local storage is not sufficient for you, you can always try Web SQL (available in WebKit and Opera) or IndexedDB (available in all modern decent browsers)