Server device, communication terminal, route retrieval system, and computer program

A computer-readable storage medium storing a computer-executable program for causing a server device, which is connected to a communication terminal in a bidirectionally communicable manner and is configured to receive a departure point, a destination, and a route retrieval request from the departure point to the destination from the communication terminal and to deliver a route retrieved in response to the received route retrieval request to the communication terminal, to perform functions comprising:

• acquiring, when the route retrieval request is acquired from the communication terminal, route information related to a target route that is a route corresponding to a predetermined distance from the departure point in a terminal-recommended route that is a route from the departure point to the destination and is retrieved by using terminal-side map information provided in the communication terminal;
• determining, in order from the departure point, whether road segments that constitute a road array identified by the acquired route information are included in server device-side map information;
• retrieving, when it is determined that a road segment that is not included in the server device-side map information is present, a route to the destination that passes through a road segment determined as being included in the server device-side map information by a time when the determination is made, the retrieved route including (i) at least a part of the target route, and (ii) the route to the destination that passes through the road segment determined as being included in the server device-side map information;
• and
• delivering the retrieved route to the communication terminal.

A communication terminal connected to a server device in a bidirectionally communicable manner and configured to transmit a departure point, a destination, and a route retrieval request from the departure point to the destination to the server device and to acquire a route that is retrieved and delivered by the server device in response to the route retrieval request, the communication terminal comprising:

• a processor programmed to:
• retrieve a route from the departure point to the destination by using terminal-side map information provided in the communication terminal;
• transmit, to the server device, the route retrieval request and route information related to a target route that is a route corresponding to a predetermined distance from the departure point in a terminal-recommended route that is the retrieved route;
• and
• receive, from the server device, a route to the destination that includes at least a part of the target route and is retrieved by the server device in response to the route retrieval request by using device-side map information provided in the server device and the route information, the route to the destination having been retrieved by the server by (i) determining, in order from the departure point, whether road segments that constitute a road array identified by the transmitted route information are included in server device-side map information and (ii) retrieving, when it is determined that a road segment that is not included in the server device-side map information is present, a route to the destination that passes through a road segment determined as being included in the server device-side map information by a time when the determination is made, the retrieved route including (i) at least a part of the target route, and (ii) the route to the destination that passes through the road segment determined as being included in the server device-side map information.

A route retrieval system, comprising a communication terminal, and a server device connected to the communication terminal in a bidirectionally communicable manner and configured to receive a departure point, a destination, and a route retrieval request from the departure point to the destination from the communication terminal and to deliver a route retrieved in response to the received route retrieval request to the communication terminal, wherein:

• the communication terminal comprises a first processor programmed to:
• retrieve a route from the departure point to the destination by using terminal-side map information provided in the communication terminal;
• transmit, to the server device, the route retrieval request and route information related to a target route that is a route corresponding to a predetermined distance from the departure point in a terminal-recommended route that is the retrieved route;
• and
• receive, from the server device, a route that is retrieved by the server device in response to the route retrieval request;
• and
• the server device comprises a second processor programmed to:
• receive the route retrieval request and the route information from the communication terminal;
• determine, in order from the departure point, whether road segments that constitute a road array identified by the acquired route information are included in server device-side map information;
• retrieve, when it is determined that a road segment that is not included in the server device-side map information is present, a route to the destination that passes through a road segment determined as being included in the server device-side map information by a time when the determination is made, the retrieved route including (i) at least a part of the target route, and (ii) the route to the destination that passes through the road segment determined as being included in the server device-side map information;
• and
• deliver the retrieved route to the communication terminal.