Apple tv with a sony wega

considering an apple TV to view pictures and videos from my iphoto and listen to music from I-tunes all on my Imac- about 5 years old. connected to linksys wireless g router

I have a sony wega from about 2007 with one HDMI input slot on the side - this is HD but rear projection 42 inch very good quality picture

My Tv is connect to the cable dvr and the saudio goes to a BOSE lifetyle 3 from about 20 years ago. excellent sound

Will i be able to utilize apple tv without a lot of new equipment and complex cable intallation.?