diff --git a/honoka/plugins/skkdic.cpp b/honoka/plugins/skkdic.cpp
index 6fffbfd..59d3600 100644
--- a/honoka/plugins/skkdic.cpp
+++ b/honoka/plugins/skkdic.cpp
@@ -19,6 +19,7 @@
  ***************************************************************************/
 
 #include "skkdic.h"
+#include <string.h>
 
 using namespace Honoka;
 
@@ -26,6 +27,7 @@
 SKKDic::SKKDic(String file)
 {
     filename = file;
+    fd = -1;
     iconv.set_encoding("EUC-JP");
     init();
 }
@@ -33,6 +35,10 @@
 
 SKKDic::~SKKDic()
 {
+    if (fd != -1) {
+        munmap(mmapptr,mmapsize);
+        close(fd);
+    }
 }
 
 
@@ -43,6 +49,25 @@
  */
 void SKKDic::init()
 {
+    if (1) {
+        fd = open(filename.c_str(),O_RDONLY);
+        if (fd == -1) return;
+        mmapsize = lseek(fd,0,SEEK_END);
+        if (mmapsize == -1) {
+            close(fd);
+            fd = -1;
+            return;
+        }
+        void *ptr = mmap(0,mmapsize,PROT_READ,MAP_PRIVATE,fd,0);
+        if (ptr == MAP_FAILED) {
+            close(fd);
+            fd = -1;
+            return;
+        }
+        mmapptr = (char *)ptr;
+        return;
+    }
+    
     bool okuri = true;
     FILE *f = fopen(filename.c_str(),"r");
     if (!f) return;
@@ -112,8 +137,40 @@
 {
     vector<SKKDicEntryData> d;
     map<WideString,SKKDicEntry>::iterator it = dic_data.find(text);
-    if (it == dic_data.end()) return d;
-    if (it->second.cache) return it->second.data;
+    if (it != dic_data.end()) {
+        if (it->second.cache) return it->second.data;
+    }
+    
+    if (fd != -1) {
+        String t;
+        iconv.convert(t,text);
+        char *p = mmapptr;
+        while(p < mmapptr + mmapsize) {
+            if ((strncmp(p,t.c_str(),t.length()) == 0) && (p[t.length()] == ' ')) {
+                string r;
+                for(unsigned int i = 1;p[t.length() + i] != '\n';i ++) {
+                    r += p[t.length() + i];
+                }
+                WideString w;
+                iconv.convert(w,r);
+                vector<WideString> l = parser(w);
+                SKKDicEntry dic;
+                for(unsigned int i = 1;i < l.size();i ++) {
+                    SKKDicEntryData e = annotationParser(l[i]);
+                    dic.data.push_back(e);
+                }
+                iconv.convert(w,t);
+                dic_data.insert(pair<WideString,SKKDicEntry>(w,dic));
+                return dic.data;
+            } else {
+                while(1) {
+                    p ++;
+                    if (*p == '\n') break;
+                }
+                p ++;
+            }
+        }
+    }
     return d;
 }
 
diff --git a/honoka/plugins/skkdic.h b/honoka/plugins/skkdic.h
index beaed5d..56d561d 100644
--- a/honoka/plugins/skkdic.h
+++ b/honoka/plugins/skkdic.h
@@ -27,6 +27,11 @@
 #include <map>
 #include <scim.h>
 #include <scim_iconv.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
 
 #define Uses_SCIM_UTILITY
 #define Uses_SCIM_ICONV
@@ -64,6 +69,9 @@
     String filename;
     IConvert iconv;
     map<WideString,SKKDicEntry> dic_data;
+    int fd;
+    char *mmapptr;
+    off_t mmapsize;
 protected:
     void init();
     vector<WideString> parser(const WideString data);