Yes. The pictures represent the products in the database. If I upload each picture from admin one by one it will takes a lot of time. Is there a fast way to do this?
If your pictures are related to products in a database, an analyzation of both product and picture tables would enable a programmer to write a script that would do everything automatically.
There are multiple ways of doing this. What I would suggest is if you would like to use a nice GUI for this feature you can check out http://silverlightuploader.codeplex.com/license. This file uploader works great, you just need to transfer it over to the nop dashboard. Once you have done that which takes about a half hour or so. There is an area call ExampleFileProcessor, this is where you will need to create your own utilities to insert each image into the DB or into the file tree using using SqlPictureProvider.InsertPicture, this inserts the picture into the db after that call to associate it with a product call the SqlProductProvicer.InsertProductPicture. These should get you rolling on bulk uploading all those images. This is a daunting task but it can be done.