In-network caching as a fundamental characteristic of ICN has been paid more attentions. How to cache is an important problem should to be answered by ICN designers and ISPs. Our argument is how to program a better cache placement within a funds limit. That is, an Internet Service Provider (ISP) wants to invest on deploying some cache equipment on the ICN router to improve the network performance. A mathematical model is built to describe the following problems simultaneously: cache type, cache location and cache capacity. And then a heuristic algorithm is presented: an Integer Linear Programming (ILP) is used for helping to achieve initial solution, while inter-layer iterative adjustment algorithm is proposed to meet the funds constraint and reduce latency. Simulation results shows that our algorithm can improve the network performance effectively, which is practical for ISP.