Appending the Rigged and Animated Model into Another Model

Hello everyone ,
I have modeled a city and a human (2 separate .blend files), That human model is rigged and animated (simple walk cycle) . I want to put that animated model in that city and I should get that animation . I approached this as usual , File --> Append , And Appended that animated model in Frame 1 (of city model) , but if I go to Frame 2 or 0, in other words other frames , that model suddenly disappears . I am using Cycle Render and Blender 2.71 .

Please help me , How to solve this problem , How to import that model so that I can get the animation ? Please help me .
Thanks . :stuck_out_tongue:

Maybe the offset is not correct. Select the character and then look at the location when you move to frame 2.
Otherwise give us the blend files so we can have a closer look.