A communication system for surveying devices, comprising: a plurality of surveying devices, each of the surveying devices comprising a surveying unit to measure a direction and a distance to a target object and a control unit to control the surveying unit, to transmit operation status information on the surveying unit and basic information to an outside network; a main server configured to receive the operation status information from the surveying device via the outside network and store the operation status information in association with identification data of the surveying device; a plurality of terminals, each of the terminals being configured to acquire the operation status information associated with the identification data of the surveying devices; and a data area setting unit (43, 46) configured to network-connect the terminal and the main server and set an accessible area in the operation status information stored in the main server on the basis of identification data of the terminal, wherein the control unit includes a questionnaire creation aid function to guide a user to create a questionnaire about the surveying unit in cooperation with the input unit when the surveying unit fails to properly survey the target object, and the control unit transmits the questionnaire to the outside network as the operation status information, further comprising an information acquiring unit (27, 28) configured to acquire operation information on the surveying unit, wherein the control unit transmits the operation information acquired by the information acquiring unit (27, 28) to the outside network via the communication unit, wherein the control unit includes a maintenance aid function to guide a user to perform maintenance of the surveying unit in cooperation with the input unit, and transmits a maintenance operation executed by the maintenance aid function as the operation status information. wherein the control unit includes a troubleshooting aid function to guide a user to find a solution for a problem of the surveying unit and execute the found solution, and transmits the found and executed solution as the operation status information, wherein the basic information refers to identification data of the surveying device, atmosphere data including temperature, humidity in a place where the surveying device is used, position information, and version data of software applied to the surveying devices. a plurality of surveying devices, each of the surveying devices comprising a surveying unit to measure a direction and a distance to a target object and a control unit to control the surveying unit, to transmit operation status information on the surveying unit and basic information to an outside network; a surveying unit to measure a direction and a distance to a target object and a control unit to control the surveying unit, to transmit operation status information on the surveying unit and basic information to an outside network; a main server configured to receive the operation status information from the surveying device via the outside network and store the operation status information in association with identification data of the surveying device; a plurality of terminals, each of the terminals being configured to acquire the operation status information associated with the identification data of the surveying devices; and a data area setting unit (43, 46) configured to network-connect the terminal and the main server and set an accessible area in the operation status information stored in the main server on the basis of identification data of the terminal, wherein the control unit includes a questionnaire creation aid function to guide a user to create a questionnaire about the surveying unit in cooperation with the input unit when the surveying unit fails to properly survey the target object, and the control unit transmits the questionnaire to the outside network as the operation status information, further comprising an information acquiring unit (27, 28) configured to acquire operation information on the surveying unit, wherein the control unit transmits the operation information acquired by the information acquiring unit (27, 28) to the outside network via the communication unit, wherein the control unit includes a maintenance aid function to guide a user to perform maintenance of the surveying unit in cooperation with the input unit, and transmits a maintenance operation executed by the maintenance aid function as the operation status information. wherein the control unit includes a troubleshooting aid function to guide a user to find a solution for a problem of the surveying unit and execute the found solution, and transmits the found and executed solution as the operation status information, wherein the basic information refers to identification data of the surveying device, atmosphere data including temperature, humidity in a place where the surveying device is used, position information, and version data of software applied to the surveying devices.