diff --git a/app/controllers/misc_controller.rb b/app/controllers/misc_controller.rb
index 423f43b..e5a2fd5 100644
--- a/app/controllers/misc_controller.rb
+++ b/app/controllers/misc_controller.rb
@@ -47,7 +47,7 @@ class MiscController < ApplicationController
       end
       zip.get_output_stream('versions.txt') do |f|
         f.puts "ruby: #{RUBY_DESCRIPTION}"
-        f.puts "fluentd: #{Fluent::VERSION}"
+        f.puts "fluentd: #{FluentdUI.fluentd_version}"
         f.puts "fluentd-ui: #{FluentdUI::VERSION}"
       end
     end
diff --git a/app/models/fluentd/agent/common.rb b/app/models/fluentd/agent/common.rb
index b22b94b..e1e0a9c 100644
--- a/app/models/fluentd/agent/common.rb
+++ b/app/models/fluentd/agent/common.rb
@@ -66,7 +66,7 @@ class Fluentd
         end
       end
 
-      %w(running? log config config_write config_append log_tail configuration).each do |method|
+      %w(running? version log config config_write config_append log_tail configuration).each do |method|
         define_method(method) do
           raise NotImplementedError, "'#{method}' method is required to be defined"
         end
diff --git a/app/models/fluentd/agent/fluentd_gem.rb b/app/models/fluentd/agent/fluentd_gem.rb
index 1e2572b..7c75fd2 100644
--- a/app/models/fluentd/agent/fluentd_gem.rb
+++ b/app/models/fluentd/agent/fluentd_gem.rb
@@ -41,6 +41,12 @@ class Fluentd
         actual_reload
       end
 
+      def version
+        Bundler.with_clean_env do
+          `fluentd --version`.strip
+        end
+      end
+
       private
 
       def options_to_argv
diff --git a/app/models/fluentd/agent/td_agent.rb b/app/models/fluentd/agent/td_agent.rb
index 53f217f..2e1e3a0 100644
--- a/app/models/fluentd/agent/td_agent.rb
+++ b/app/models/fluentd/agent/td_agent.rb
@@ -25,6 +25,10 @@ class Fluentd
         # https://github.com/treasure-data/td-agent/blob/master/debian/td-agent.init#L156
         system('/etc/init.d/td-agent restart')
       end
+
+      def version
+        `td-agent --version`.strip
+      end
     end
   end
 end
diff --git a/app/models/plugin.rb b/app/models/plugin.rb
index 9da967c..58dccd2 100644
--- a/app/models/plugin.rb
+++ b/app/models/plugin.rb
@@ -190,11 +190,16 @@ class Plugin
   end
 
   def fluent_gem_path
+    # On installed both td-agent and fluentd system, decide which fluent-gem command should be used depend on setup(Fluentd.instance)
+    if Fluentd.instance && Fluentd.instance.fluentd?
+      return "fluent-gem" # maybe `fluent-gem` command is in the $PATH
+    end
+
+    # NOTE: td-agent has a command under the /usr/lib{,64}, td-agent2 has under /opt/td-agent
     %W(
-      fluent-gem
+      /opt/td-agent/embedded/bin/fluent-gem
       /usr/lib/fluent/ruby/bin/fluent-gem
       /usr/lib64/fluent/ruby/bin/fluent-gem
-      /opt/td-agent/embedded/bin/fluent-gem
     ).find do |path|
       system("which #{path}", out: File::NULL, err: File::NULL)
     end
diff --git a/app/views/misc/information.html.haml b/app/views/misc/information.html.haml
index c4fff1f..d4a4a7f 100644
--- a/app/views/misc/information.html.haml
+++ b/app/views/misc/information.html.haml
@@ -24,7 +24,7 @@
           %dt ruby
           %dd= RUBY_DESCRIPTION
           %dt fluentd
-          %dd= Fluent::VERSION
+          %dd= FluentdUI.fluentd_version
           %dt fluentd-ui
           %dd= FluentdUI::VERSION
 
@@ -51,9 +51,8 @@
   %div.col-lg-12
     %div.panel.panel-default
       %div.panel-heading
-        %h4
-          %a{"data-toggle" => "collapse", "href" => "#env-table"}
-            = icon('fa-caret-down')
+        %h4{"data-toggle" => "collapse", "href" => "#env-table"}
+          = icon('fa-caret-down')
           = t('.env')
       %table{class: "table table-hover collapse", id: "env-table"}
         %thead
diff --git a/app/views/shared/_global_nav.html.erb b/app/views/shared/_global_nav.html.erb
index b57b0d8..817f2ca 100644
--- a/app/views/shared/_global_nav.html.erb
+++ b/app/views/shared/_global_nav.html.erb
@@ -12,6 +12,8 @@
     </ul>
     <% end %>
   </li>
+
+  <% if fluentd_exists? %>
   <li>
     <%= link_to_other icon("fa-cogs fa-fw") << " " << t('terms.plugins') << icon('fa pull-right fa-caret-down'), plugins_path %>
     <ul class="nav nav-second-level">
@@ -27,6 +29,8 @@
     </ul>
     <!-- /.nav-second-level -->
   </li>
+  <% end %>
+
   <li>
     <%= link_to_other icon('fa-coffee fa-fw') << " " << t('terms.misc') << icon('fa pull-right fa-caret-down'), misc_path %>
     <ul class="nav nav-second-level">
diff --git a/lib/fluentd-ui.rb b/lib/fluentd-ui.rb
index b4e001f..0dcb7ef 100644
--- a/lib/fluentd-ui.rb
+++ b/lib/fluentd-ui.rb
@@ -13,4 +13,10 @@ module FluentdUI
     current = Gem::Version.new(::FluentdUI::VERSION)
     latest > current
   end
+
+  def self.fluentd_version
+    setup_fluentd = Fluentd.instance
+    return nil unless setup_fluentd
+    setup_fluentd.agent.version
+  end
 end