Whether my apps delete after software update in Sony Xperia tipo in Sony Service centre? My Android deivce is a Sony Xperia Tipo.

Recently, I got my Tipo's System Software Updated from Sony Service Centre.

I also found that sans-update, some (or all) of my installed Apps as absent/uninstalled.

Please help me regarding this.

Thank you in advance.
If you're going to send it in for service, they might decide to make a "clean install". In that case, your apps and data are of course gone. With a "normal update", apps and data might survive.

But it's never a bad idea to make a backup (see also our backup tag-wiki for hints, as well as the links to further information contained there – especially Full Backup of non-rooted devices). This way, even if some or all apps don't survive the update, you can still restore them from your backup.