How to add files instead of replacing them by syncing?

Question

Someone presented me an I pad, and when I got it, he already put files in it, so now that i need to add things on it from my own computer with Itunes, it does not want to add but to replace. I want just to add, please explain how can I do this.

Answer 1

For photos, iTunes is basically just a tool for adding them to a device, they don't get added to your iTunes library in the same way that music, films etc do. If he synced them from a computer then you can copy them over to your computer, but you will need an app on your iPad e.g Simple Transfer allows you to copy photos to/from an iPad (or iPhone or iPod Touch) via your wifi network. If they were taken with the iPad, copied to it via the camera connection kit or saved from email/websites (e.g. they are in the Camera Roll album in the Photos app) then you should be able to copy them off via the camera wizard in a windows PC, or iPhoto, Aperture or Image Capture on a Mac : copying photos.
An iPad is only designed to be synced to one computer at a time, so to sync content you will need to 'associate' the iPad with your computer : https://discussions.apple.com/docs/DOC-3141 . But the account that originally bought/downloaded the app (or film, music etc) will need to be authorised on your computer's iTunes to be able to copy it over to your computer's iTunes via File > (Devices > ) Transfer Purchases. All iTunes downloads are tied to the account that downloads it, and they can't be transferred to a different account.
Depending upon what app the word documents are in and what the app supports, then you may be able to email them to yourself, copy them off via your wifi network, or use the file sharing section. If the videos aren't iTunes purchases (if they are then they will be tied to his account) then you can also copy them off, but you will need a program on your computer to do so - there are some listed half-way down this page.
If you want to add photos to the iPad, then only the synced photos will remain on the iPad - synced photos can't be deleted directly on the iPad, instead they are removed by not including them in the next photo sync (so if you want the synced photos that the other person put on it then you will need to copy them to your computer first so that you can include them in your syncing).
If you are on iTunes 11 on your computer then you may want to re-enable the left-hand sidebar via View > Show Sidebar (option-command-S on a Mac, control-S on a PC), which might make it easier to navigate and my instructions may make more sense.
To sync photos, connect and select your iPad on the left-hand side of your computer's iTunes (if you've enabled the sidebar), and on the right-hand side there should be a series of tabs, one of which should be Photos - if you select that tab you can then select which photo folders to sync to the iPad. There is a bit more info on this page.
If you haven't enabled the sidebar, then from your library click 'iPad' at the top right of the screen and you should get a series of buttons along the top of the screen, including one for Photos.