Information-centric networking (ICN) is expected as a novel network architecture for content delivery services. In ICN, content routers (CRs) with a cache function store a chunk received from upstream CRs or servers. Therefore, clients can retrieve distributed chunks from multiple nodes simultaneously. However, it will cause heavy congestion due to competition of multiple flows in a network as well as long time to acquire content. In this study, we propose an efficient congestion control scheme to retrieve distributed chunks from multiple nodes in ICN. This scheme aggregates competing flows and then allocates an adequate transmission rate to the aggregated flows. We show the effictiveness of the proposed scheme through simulation evaluations.