An ultrasound system comprising: an ultrasound probe; and a handheld information terminal connected to the ultrasound probe in a wired or wireless manner, wherein the information terminal includes an operation information storage unit that stores a plurality of pieces of operation information corresponding to an operation, which is performed by a user for resolving an error, for each type of the error, and an error processing unit that, in a case where occurrence of the error is detected, displays first operation information as at least one piece of operation information with the highest priority among the plurality of pieces of operation information corresponding to the type of the error that has occurred, and in a case where the number of times of the operation corresponding to the first operation information, which is performed by the user, has reached a predetermined number within a predetermined period after the first operation information is displayed, any of: (i) displays second operation information as at least one piece of operation information with the highest priority next to the first operation information; (ii) displays server-side operation information corresponding to information on the type of the error that has occurred and information on the number of times of the operation, which is received from a server connected to the information terminal via a network; (iii) reads second operation information as at least one piece of operation information with the highest priority next to the first operation information, by sound; or (iv) displays reference destination information representing a reference destination of related information that relates to the error. an ultrasound probe; and a handheld information terminal connected to the ultrasound probe in a wired or wireless manner, wherein the information terminal includes an operation information storage unit that stores a plurality of pieces of operation information corresponding to an operation, which is performed by a user for resolving an error, for each type of the error, and an error processing unit that, in a case where occurrence of the error is detected, displays first operation information as at least one piece of operation information with the highest priority among the plurality of pieces of operation information corresponding to the type of the error that has occurred, and in a case where the number of times of the operation corresponding to the first operation information, which is performed by the user, has reached a predetermined number within a predetermined period after the first operation information is displayed, any of: (i) displays second operation information as at least one piece of operation information with the highest priority next to the first operation information; (ii) displays server-side operation information corresponding to information on the type of the error that has occurred and information on the number of times of the operation, which is received from a server connected to the information terminal via a network; (iii) reads second operation information as at least one piece of operation information with the highest priority next to the first operation information, by sound; or (iv) displays reference destination information representing a reference destination of related information that relates to the error. an operation information storage unit that stores a plurality of pieces of operation information corresponding to an operation, which is performed by a user for resolving an error, for each type of the error, and an error processing unit that, in a case where occurrence of the error is detected, displays first operation information as at least one piece of operation information with the highest priority among the plurality of pieces of operation information corresponding to the type of the error that has occurred, and in a case where the number of times of the operation corresponding to the first operation information, which is performed by the user, has reached a predetermined number within a predetermined period after the first operation information is displayed, any of: (i) displays second operation information as at least one piece of operation information with the highest priority next to the first operation information; (ii) displays server-side operation information corresponding to information on the type of the error that has occurred and information on the number of times of the operation, which is received from a server connected to the information terminal via a network; (iii) reads second operation information as at least one piece of operation information with the highest priority next to the first operation information, by sound; or (iv) displays reference destination information representing a reference destination of related information that relates to the error. (i) displays second operation information as at least one piece of operation information with the highest priority next to the first operation information; (ii) displays server-side operation information corresponding to information on the type of the error that has occurred and information on the number of times of the operation, which is received from a server connected to the information terminal via a network; (iii) reads second operation information as at least one piece of operation information with the highest priority next to the first operation information, by sound; or (iv) displays reference destination information representing a reference destination of related information that relates to the error.