diff --git a/src/App.jsx b/src/App.jsx
index 15bdf41..5a6803d 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -1350,6 +1350,114 @@ function RelationPopup({ programs, onToggleRelation, onClose }) {
   );
 }
 
+function RelationTreePanel({ programs, onProgramClick, onOpenRelationPopup }) {
+  const [expandedProgramIds, setExpandedProgramIds] = useState(() => new Set(programs.map((program) => program.id)));
+  const programMap = Object.fromEntries(programs.map((program) => [program.id, program]));
+  const linkedChildIds = new Set(programs.flatMap((program) => program.successors ?? []));
+  const rootPrograms = programs.filter((program) => !linkedChildIds.has(program.id));
+  const visibleRoots = rootPrograms.length ? rootPrograms : programs.slice(0, 1);
+
+  const toggleExpanded = (programId) => {
+    setExpandedProgramIds((current) => {
+      const next = new Set(current);
+      if (next.has(programId)) {
+        next.delete(programId);
+      } else {
+        next.add(programId);
+      }
+      return next;
+    });
+  };
+
+  const renderNode = (program, depth = 0, visitedIds = new Set()) => {
+    const successors = (program.successors ?? [])
+      .map((successorId) => programMap[successorId])
+      .filter(Boolean);
+    const hasChildren = successors.length > 0;
+    const isExpanded = expandedProgramIds.has(program.id);
+    const isRepeated = visitedIds.has(program.id);
+    const hasMultipleInputs = (program.predecessors ?? []).length > 1;
+    const nextVisitedIds = new Set(visitedIds);
+    nextVisitedIds.add(program.id);
+
+    return (
+      <div key={`${program.id}-${depth}-${[...visitedIds].join('-')}`} className="relative">
+        {depth > 0 && (
+          <span
+            className="absolute left-[11px] top-0 h-full border-l border-dashed border-slate-200"
+            aria-hidden="true"
+          />
+        )}
+        <div
+          className="relative flex items-center gap-2 py-1.5"
+          style={{ paddingLeft: `${depth * 18}px` }}
+        >
+          {hasChildren && !isRepeated ? (
+            <button
+              type="button"
+              onClick={() => toggleExpanded(program.id)}
+              className="relative z-10 flex h-5 w-5 shrink-0 items-center justify-center rounded-full bg-white text-[11px] font-black text-slate-500 ring-1 ring-slate-200 hover:bg-slate-50"
+              aria-label={`${program.name} 하위 프로그램 ${isExpanded ? '접기' : '펼치기'}`}
+            >
+              {isExpanded ? '−' : '+'}
+            </button>
+          ) : (
+            <span className="relative z-10 h-5 w-5 shrink-0 rounded-full bg-slate-100 ring-1 ring-slate-200" />
+          )}
+          <button
+            type="button"
+            onClick={() => onProgramClick(program.id)}
+            className="min-w-0 flex-1 rounded-xl bg-white/85 px-3 py-2 text-left shadow-sm ring-1 ring-slate-100 transition hover:-translate-y-0.5 hover:bg-white hover:shadow"
+          >
+            <span className="block truncate text-[13px] font-black text-slate-900">
+              {program.name}
+            </span>
+            <span className="mt-0.5 block truncate text-[11px] font-semibold text-slate-500">
+              {program.description}
+            </span>
+          </button>
+          {hasMultipleInputs && (
+            <span className="rounded-full bg-violet-50 px-2 py-1 text-[10px] font-black text-violet-600 ring-1 ring-violet-100">
+              다중
+            </span>
+          )}
+        </div>
+        {hasChildren && isExpanded && !isRepeated && (
+          <div className="ml-2">
+            {successors.map((successor) => renderNode(successor, depth + 1, nextVisitedIds))}
+          </div>
+        )}
+      </div>
+    );
+  };
+
+  return (
+    <aside className="sticky top-5 max-h-[calc(100vh-40px)] overflow-y-auto rounded-[28px] border border-white/75 bg-white/75 p-4 shadow-sm backdrop-blur">
+      <div className="mb-4 flex items-start justify-between gap-3">
+        <div>
+          <p className="text-[11px] font-black uppercase tracking-wide text-blue-700">Program Map</p>
+          <h2 className="mt-1 text-lg font-black text-slate-950">프로그램 연결</h2>
+          <p className="mt-1 text-xs font-semibold leading-5 text-slate-500">
+            선행·후행 관계를 세로 트리로 봅니다.
+          </p>
+        </div>
+        <button
+          type="button"
+          onClick={onOpenRelationPopup}
+          className="flex h-9 w-9 shrink-0 items-center justify-center rounded-full bg-amber-100 text-base font-black text-amber-700 ring-1 ring-amber-200 hover:bg-amber-200"
+          title="프로그램 연결도 및 관계 수정"
+          aria-label="프로그램 연결도 및 관계 수정"
+        >
+          !
+        </button>
+      </div>
+      <div className="space-y-1">
+        {visibleRoots.map((program) => renderNode(program))}
+      </div>
+    </aside>
+  );
+}
+
 export default function App() {
   const urlParams = new URLSearchParams(window.location.search);
   const isDetailWindow = urlParams.get('view') === 'program-detail' || urlParams.get('view') === 'cheonjiin-detail';
@@ -1996,15 +2104,6 @@ export default function App() {
     <main className="min-h-screen bg-[radial-gradient(circle_at_top_left,#dffcf4_0,#f7f8fa_34%,#eef2ff_100%)] text-slate-900">
       <div className="mx-auto max-w-[1600px] space-y-5 px-6 py-6">
         <div className="flex justify-end gap-2">
-          <button
-            type="button"
-            onClick={() => setIsRelationPopupOpen(true)}
-            className="flex h-10 w-10 items-center justify-center rounded-full bg-amber-100 text-lg font-black text-amber-700 shadow-sm ring-1 ring-amber-200 hover:bg-amber-200"
-            title="프로그램 연결도 및 관계 수정"
-            aria-label="프로그램 연결도 및 관계 수정"
-          >
-            !
-          </button>
           <button
             type="button"
             onClick={toggleProgramEdit}
@@ -2019,8 +2118,16 @@ export default function App() {
           </button>
         </div>
 
+        <div className="grid gap-5 xl:grid-cols-[310px_minmax(0,1fr)] xl:items-start">
+          <RelationTreePanel
+            programs={programs}
+            onProgramClick={openProgramWindow}
+            onOpenRelationPopup={() => setIsRelationPopupOpen(true)}
+          />
+
+          <section className="min-w-0 space-y-5">
         {isEditing && (
-          <section className="flex items-center justify-between rounded-[24px] border border-white/70 bg-white/70 px-5 py-4 shadow-sm backdrop-blur">
+          <div className="flex items-center justify-between rounded-[24px] border border-white/70 bg-white/70 px-5 py-4 shadow-sm backdrop-blur">
             <div>
               <p className="text-[12px] font-extrabold uppercase tracking-wide text-blue-700">
                 프로그램 편집
@@ -2037,7 +2144,7 @@ export default function App() {
               <Plus className="h-4 w-4" />
               프로그램 추가
             </button>
-          </section>
+          </div>
         )}
 
         <FlowRow
@@ -2200,6 +2307,9 @@ export default function App() {
           </React.Fragment>
         ))}
 
+          </section>
+        </div>
+
         {isRelationPopupOpen && (
           <RelationPopup
             programs={programs}