diff --git a/B03_FileInput/B03_FileInput_UI_Page.ts b/B03_FileInput/B03_FileInput_UI_Page.ts
index ea8877dd..9447cec8 100644
--- a/B03_FileInput/B03_FileInput_UI_Page.ts
+++ b/B03_FileInput/B03_FileInput_UI_Page.ts
@@ -504,6 +504,8 @@ export async function renderB03FileInput(root: HTMLElement): Promise<void> {
       ".b03-file__slot-input",
     )!;
     input.accept = state.extensions.join(",");
+    // 계획노선 shapefile은 한 벌(.shp/.shx/.dbf/.cpg/.prj)을 같이 골라야 한다.
+    input.multiple = state.extensions.includes(".shp");
     const select = card.querySelector<HTMLButtonElement>(
       ".b03-file__card-select",
     )!;