How can be detect is device router or host by using snmp. I tried to use google. But nothing found.
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You can try to determine device type by polling sysObjectID (126.96.36.199.188.8.131.52) - this should give you information about the vendor and device type (see e.g. CISCO-PRODUCTS-MIB for the list of Cisco routers sysOIDs).
The other option is RFC-1213 sysServices which can indicate the routing capability of the device.
The following SF question has some details about routing table, which can serve as additional source of information http://serverfault.com/questions/41842/snmp-equivalent-for-show-ip-route.